Receive Window Auto-Tuning feature for HTTP traffic on Windows Vista-based computers

This article describes how the Receive Window Auto-Tuning feature improves data transfer, how to enable/diable this feature for HTTP traffic on Windows Vista-based computers, and issues that may occur after you enable this feature for HTTP traffic.

Original product version: В Windows Vista
Original KB number: В 947239

Introduction

Windows Vista includes the Receive Window Auto-Tuning feature that improves performance for programs that receive TCP data over a network. However, this feature is disabled by default for programs that use the Windows HTTP Services (WinHTTP) interface. Some examples of programs that use WinHTTP include Automatic Updates, Windows Update, Remote Desktop Connection, Windows Explorer (network file copy), and Sharepoint (WebDAV).

If you enable Receive Window Auto-Tuning for WinHTTP traffic, data transfers over the network may be more efficient. However, in some cases you might experience slower data transfers or loss of connectivity if your network uses an older router and firewall that does not support this feature. For example, when you use Windows Internet Explorer to access applications that are hosted in Microsoft Office SharePoint Server, the HTTP traffic may slow down. This occurs because certain routers do not support the Receive Window Auto-Tuning feature.

Since the release of Windows 7, Receive Window Auto-Tuning is now available for programs that use the Windows Internet (WinINet) application programming interface (API) for HTTP requests instead of WinHTTP. Some examples of programs that use WinINet for HTTP traffic include Internet Explorer, Outlook, and Outlook Express.

How Receive Window Auto-Tuning feature improves data transfer

The Receive Window Auto-Tuning feature lets the operating system continually monitor routing conditions such as bandwidth, network delay, and application delay. Therefore, the operating system can configure connections by scaling the TCP receive window to maximize the network performance. To determine the optimal receive window size, the Receive Window Auto-Tuning feature measures the products that delay bandwidth and the application retrieve rates. Then, the Receive Window Auto-Tuning feature adapts the receive window size of the ongoing transmission to take advantage of any unused bandwidth.

Enable Receive Window Auto-Tuning feature for WinHTTP traffic

Prerequisites: You must be running Windows Vista Service Pack 2 or Windows Vista Service Pack 1, or have hotfix 939006 installed to enable auto-tuning for WinHTTP.

This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: 322756 How to back up and restore the registry in Windows
To enable the Receive Window Auto-Tuning feature for HTTP traffic, you must edit the registry. To do this, follow these steps:

1. Click Start, type regedit in the Start Search box, and then press ENTER.
2. Locate and then right-click the registry subkey HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp .
3. Point to New, and then click DWORD Value.
4. Type TcpAutotuning, and then press ENTER.
5. Right-click TcpAutotuning, and then click Modify.
6. In the Value data box, type 1, and then click OK.
7. Exit Registry Editor.
8. Restart the computer.

The Receive Window Auto-Tuning feature is enabled for HTTP traffic if the TcpAutotuning registry entry is set to 1. The Receive Window Auto-Tuning feature is not enabled for HTTP traffic if the TcpAutotuning registry entry does not exist or if it is set to a value that is not 1.

To enable the Windows Internet (WinINet) in Windows 7, follow these steps:

Click Start, type regedit in the Search programs and files box, and then press ENTER.

Locate and then right-click the registry subkey HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings .

Point to New, and then click DWORD Value.

Type TcpAutotuning, and then press ENTER.

Right-click TcpAutotuning, and then click Modify.

In the Value data box, type 1, and then click OK.

Repeat step 2 through step 6 to add a TcpAutotuning entry with DWORD value of 1 under the following registry subkey:

Exit Registry Editor.

Restart the computer.

WinINet is enabled if the TcpAutotuning registry entries are set to 1. WinINet is not enabled if the TcpAutotuning registry entries do not exist or if they are set to a value that is not 1.

Check whether the problem is fixed. If the problem is fixed, you are finished with this article. If the problem is not fixed, you can contact support.

Issues that may occur after you enable the Receive Window Auto-Tuning feature for HTTP traffic

When the Receive Window Auto-Tuning feature is enabled for HTTP traffic, older routers, older firewalls, and older operating systems that are incompatible with the Receive Window Auto-Tuning feature may sometimes cause slow data transfer or a loss of connectivity. When this occurs, users may experience slow performance. Or, the applications may crash. These older devices do not comply with the RFC 1323 standard. Some device manufacturers provide software that works around the hardware limitations. Contact the device manufacturer to determine whether this kind of software is available.

If the incompatible devices are outside your organization, and you cannot change the devices, this issue will remain. Therefore, you may have to disable the Receive Window Auto-Tuning feature for HTTP traffic.

Disable the Receive Window Auto-Tuning feature

To disable the Receive Window Auto-Tuning feature for HTTP traffic, follow these steps:

Log on to the computer as a user who has administrative credentials.

Click Start, type runas /user: local_computer_name \administrator cmd in the Start Search box, and then press ENTER.

When you are prompted for the administrator account password, type the correct password, and then press ENTER.

At the command prompt, type the following command, and then press ENTER:

Exit the Command Prompt window.

Restart the computer.

Check whether the problem is fixed. If the problem is fixed, you are finished with this article. If the problem is not fixed, you can contact support.

TCP/IP Receive Window Auto-Tuning снижает скорость интернета в Windows 10 Anniversary Если вы заметили, что TCP/IP Receive Window Auto-Tuning снижает скорость интернета в Windows 10 Anniversary, тогда вам необходимо срочно обратиться к настройкам данной

Некоторые пользователи используют «десятку» достаточно долго и в какой-то момент, начинают замечать, что у них возникли проблемы с интернет-соединением, которое стало достаточно медленным. Именно по этой причине, мы рекомендуем вам обратить внимание на данную статью, так как в ней пойдет речь о том, как TCP/IP Receive Window Auto-Tuning снижает скорость интернета в Windows 10 Anniversary, что собственно и становится для большинства пользователей ПК камнем преткновения с бесчисленным количеством проблем.

Для тех из вас, кто не в курсе, поясняем, что функция TCP/IP Receive Window Auto-Tuning была создана еще несколько лет назад и предназначалась она для того, чтоб поднимать производительность приложений взаимодействующих с сетевыми подключениями, которые так или иначе участвуют в обмене TCP-пакетами по сети. Так как функция в предыдущих версиях ОС Windows оказалась вполне работоспособной, то и в «десятку» она перебралась благополучно. Вот только в последней версии ОС, с вышеназванной функцией произошло что-то не то, ведь мало того, что в настройках «по умолчанию» она включена, так ещё бывают ситуации, когда происходит сбой и функция начинает беспощадно «жрать» интернет трафик.

Для того, чтоб проверить правильность работы TCP/IP Receive Window Auto-Tuning, вам необходимо произвести открытие от имени Администратора командной строки и прописать в неё команду вида «netsh interface tcp show global» (без кавычек) → в результате, перед вами появится список глобальных параметров TCP и уже в нём, вам необходимо отыскать пункт «Уровень автонастройки окна получения» и посмотреть, чтоб он имел значение «normal»:

Значение «normal» информирует нас с вами о том, что функция полностью включена.

Теперь, необходимо произвести тестирование скорости интернета имеющимися у вас средствами → запишите полученные данные → отключите TCP/IP Receive Window Auto-Tuning при помощи команды «netsh int tcp set global autotuninglevel=disabled» (без кавычек) → еще раз протестируйте скорость интернет-соединения → запишите полученные данные в данный момент → произведите сравнение полученных данных по скорости интернет-соединения после двух замеров.

Если функция TCP/IP Receive Window Auto-Tuning снижает скорость интернета в Windows 10 Anniversary, то во втором числовом значение после замера интернет-соединения, скорость интернета будет выше! Таким образом, вам стоит оставить отключенной функцию «Auto-Tuning», так как в ней и заключались ваши проблемы.

Если же во время сравнения замеров скорости интернет-соединения не какой разницы замечено не было, тогда функцию «Auto-Tuning» стоит включить, а для этого вам нужно просто выполнить в консоли CMD команду «netsh int tcp set global autotuninglevel=normal» (без кавчек).

Ограничивает ли Windows 10 скорость вашего интернета

Если с обновлением ОС Windows скорость передачи данных по сети заметно снизилась, следующее руководство может помочь в устранении неполадок.

Функция «Уровень автонастройки окна получения» была представлена компанией Microsoft с выходом ОС Windows Vista, и с тех пор она присутствует в каждой последующую версии.

Задействованная функция призвана повысить эффективность работы сетевых приложений, получающих TCP-данные. Несмотря на это, зачастую пользователи замечают снижение ее скорости и даже испытывают проблемы с подключением.

Для начала необходимо проверить статус Window Auto-Tuning, поскольку есть вероятность, что включенная функция является виновником возникших проблем. Для этого откройте окно терминала Windows с административными правами, впишите «netsh interface tcp show global» и нажмите клавишу «Enter».

Среди полученной информации найдите название необходимой функции. Если она задействована, напротив нее отобразится статус «normal».

Используя команду «netsh int tcp set global autotuninglevel=disabled» отключите функцию и запустите тестирование скорости сети с целью определения ее влияния на обмен TCP-данными.

Если негативное влияние на скорость обмена данными не подтвердилось, снова включите функцию, используя команду «netsh int tcp set global autotuninglevel=normal».

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Windows Ускорение TCP

Windows Vista introduces a number of new features to the TCP/IP stack, including CTCP, and TCP Window Auto-Tuning. This new implementation works much better by default than previous Windows versions with broadband internet connections, and is able to adjust the RWIN value on the fly, depending on the BDP (bandwidth-delay product). This, however, introduces some problems with older routers and restricts the user from tweaking some of the TCP/IP parameters. Still, there is always some room for improvement, and this article explains the known tweakable TCP/IP parameters.

To enter some of the commands below, you will need to run «elevated» command prompt. To do so, click the Start icon > Run > type: cmd , then click CTRL+SHIFT+ENTER. Alternatively, you can navigate to Start > All Programs > Accessories > right-click Command Prompt and choose «Run as Administrator».

Check the TCP/IP state

To check the current status of the Vista TCP/IP tweakable parameters, in elevated command prompt type the following command:

netsh int tcp show global

You will be presented with something like the following:

The settings, as well as their default and recommended state are explained below. The two most important tweakable parameters are «Auto-Tuning Level» and «Congestion Control Provider».

When checking the TCP state with the «netsh int tcp show global» command, it is also possible to see the following message below all those parameters:

** The above autotuninglevel setting is the result of Windows Scaling heuristics overriding any local/policy configuration on at least one profile.

It is displayed when the «Receive Window Auto-Tuning Level» is not explicitly set, or if the system deemed it necessary to make a change because of user prompted «repairing» of your network connection, for example.

Disable Windows Scaling heuristics

Windows Vista/7 has the ability to automatically change its own TCP Window auto-tuning behavior to a more conservative state regardless of any user settings. It is possible for Windows to override the autotuninlevel even after an user sets their custom TCP auto-tuning level. When that behavior occurs, the «netsh int tcp show global» command displays the following message:

** The above autotuninglevel setting is the result of Windows Scaling heuristics
overriding any local/policy configuration on at least one profile.

To prevent that behavior and enforce any user-set TCP Window auto-tunning level, you should execute the following command:

netsh int tcp set heuristics disabled

possible settings are: disabled,enabled,default (sets to the Windows default state)
recommended: disabled (to retain user-set auto-tuning level)

Note this should be executed in elevated command prompt (with admin priviledges) before setting the autotuninlevel in next section. If the command is accepted by the OS you will see an «Ok.» on a new line.

The corresponding Registry value (not necessary to edit if setting via netsh) is located in:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControl Set\services\Tcpip\Parameters
EnableWsd=0 (default: 1, recommended: 0)

TCP Auto-Tuning

To turn off the default RWIN auto tuning behavior, (in elevated command prompt) type:

netsh int tcp set global autotuninglevel=disabled

The default auto-tuning level is «normal», and the possible settings for the above command are:

disabled: uses a fixed value for the tcp receive window. Limits it to 64KB (limited at 65535).
highlyrestricted: allows the receive window to grow beyond its default value, very conservatively
restricted: somewhat restricted growth of the tcp receive window beyond its default value
normal: default value, allows the receive window to grow to accommodate most conditions
experimental: allows the receive window to grow to accommodate extreme scenarios (not recommended, it can degrade performance in common scenarios, only intended for research purposes. It enables RWIN values of over 16 MB)

Our recommendation: normal (unless you’re experiencing problems).

If you’re experiencing problems with your NAT router or SPI firewall, try the «restricted», «highlyrestricted», or even «disabled» state.

Notes:
— Reportedly, some older residential NAT routers with a SPI firewall may have problems with enabled tcp auto-tuning in it’s «normal» state, resulting in slow speeds, packet loss, reduced network performance in general.
— auto-tuning also causes problems with really old routers that do not support TCP Windows scaling. See MSKB 935400
— netsh set commands take effect immediately after executing, there is no need to reboot.
— sometimes when using «normal» mode and long lasting connections (p2p software / torrents), tcp windows can get very large and consume too much resources, if you’re experiencing problems try a more conservative (restricted) setting.

If you’re experiencing problems with Auto-Tuning, see also:
MSKB 835400 — email issues
MSKB 934430 — network connectivity behind firewall problems
MSKB 940646 — 3G WWAN throughput issues
MSKB 929868 — web browsing issues
MSKB 932170 — slow network file transfer

Compound TCP — Improve throughput
Add-On Congestion Control Provider

The traditional slow-start and congestion avoidance algorithms in TCP help avoid network congestion by gradually increasing the TCP window at the beginning of transfers until the TCP Receive Window boundary is reached, or packet loss occurs. For broadband internet connections that combine high TCP Window with higher latency (high BDP), these algorithms do not increase the TCP windows fast enough to fully utilize the bandwidth of the connection.

Compound TCP (CTCP) is a newer method, available in Vista and Server 2008 (there is also a hotfix available for XP x64 and 2003 Server — MSKB 949316). CTCP increases the TCP send window more aggressively for broadband connections (with large RWIN and BDP). CTCP attempts to maximize throughput by monitoring delay variations and packet loss. It also ensures that its behavior does not impact other TCP connections negatively.

By default, Vista and Windows 7 have CTCP turned off, it is only on by default under Server 2008. Turning this option on can significantly increase throughput and packet loss recovery.

To enable CTCP, in elevated command prompt type:

netsh int tcp set global congestionprovider=ctcp

netsh int tcp set global congestionprovider=none

Possible options are: ctcp, none, default (restores the system default value).
Recommended setting: ctcp

It is better to use this newer generation CTCP congestion control algorithm for most broadband connections, we highly recommend it being turned on.

ECN Capability

ECN (Explicit Congestion Notification, RFC 3168) is a mechanism that provides routers with an alternate method of communicating network congestion. It is aimed to decrease retransmissions. In essence, ECN assumes that the cause of any packet loss is router congestion. It allows routers experiencing congestion to mark packets and allow clients to automatically lower their transfer rate to prevent further packet loss. Traditionally, TCP/IP networks signal congestion by dropping packets. When ECN is successfully negotiated, an ECN-aware router may set a bit in the IP header (in the DiffServ field) instead of dropping a packet in order to signal congestion. The receiver echoes the congestion indication to the sender, which must react as though a packet drop were detected.

ECN is disabled by default in Vista and other modern TCP/IP implementations, as it is possible that it may cause problems with some outdated routers that drop packets with the ECN bit set, rather than ignoring the bit. To check whether your router supports ECN, you can use the Microsoft Internet Connectivity Evaluation Tool. The results will be displayed under «Traffic Congestion Test».

To change ECN, in elevated command prompt type:

netsh int tcp set global ecncapability=default

Possible settings are: enabled, disabled, default (restores the state to the system default).
The default state is: disabled
Recommendation: enabled (only for short-lived, interactive connections and HTTP requests with routers that support it, in the presense of congestion/packet loss), disabled otherwise (for pure bulk throughput with large TCP Window, no regular congestion/packet loss, or outdated routers without ECN support).

Notes: ECN is only effective in combination with AQM (Active Queue Management) router policy. It has more noticeable effect on performance with interactive connections and HTTP requests, in the presense of router congestion/packet loss. Its effect on bulk throughput with large TCP Window are less clear.

Currently, we do not recommend enabling this setting, as reportedly it has negative impact on throughput with some residential US ISPs. EA multiplayer games that require a profile logon do not support ECN as well (you will not be able to logon).

RSS — Receive-side Scaling

The receive-side scaling setting enables parallelized processing of received packets on multiple processors, while avoiding packet reordering. It avoids packet reordering y separating packets into «flows», and using a single processor for processing all the packets for a given flow. Packets are separated into flows by computing a hash value based on specific fields in each packet, and the resulting hash values are used to select a processor for processing the flow. This approach ensures that all packets belonging to a given TCP connection will be queued to the same processor, in the same order that they were received by the network adapter.

netsh int tcp set global rss=enabled

Possible rss settings are: disabled, enabled, default (restores rss state to the system default).
Default state is: enabled
Recommended: enabled (if you have 2 or more processor cores and a NIC that can handle RSS)

TCP Chimney Offload

TCP chimney offload enables Windows to offload all TCP processing for a connection to a network adapter. Offloads are initiated on a per-connection basis. Compared to task offload, TCP chimney offload further reduces networking-related CPU overhead, enabling better overall system performance by freeing up CPU time for other tasks.

To set TCP Chimney Offload:

netsh int tcp set global chimney=enabled

Default state: disabled (under Vista), automatic (under Windows 7 and 2008 Server)
Recommended: enabled

The possible states are disabled, enabled, default (Vista), automatic (only Windows 7 and 2008 Server) as follows:

automatic — This default setting is only available under Windows 7 and 2008 Server, it is not available udner Vista. It offloads if the connection is 10 GbE, has a RTT Direct Cache Access (DCA)

Windows 7 and 2008 Server (but not Vista) add NETDMA 2.0 Direct cache access support. Direct Cache Access (DCA) allows a capable I/O device, such as a network controller, to deliver data directly into a CPU cache. The objective of DCA is to reduce memory latency and the memory bandwidth requirement in high bandwidth (Gigabit) environments. DCA requires support from the I/O device, system chipset, and CPUs.

netsh int tcp set global dca=enabled

Available states are: enabled, disabled.
Default state: disabled
Recommended: enabled (provided the CPU/Chipset/NIC support it)

It is also possible to enable this setting by editing the Windows Registry instead of using netsh as follows:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControl Set\Services\Tcpip\Parameters
EnableDCA=1 (DWORD, entry does not exist by default. Set to 1 to enable, 0 to disable)

Setting MTU

It is sometimes useful to view and set the MTU value for a specific network interface manually. To view a list of active network interfaces and their MTU values in Vista using netsh, open command prompt as administrator and execute the following command:

netsh interface ipv4 show subinterface

You will be presented with a list of interfaces, and their respective MTU values as follows:

To change the MTU value of a specific network card, type the following in command prompt:

netsh interface ipv4 set subinterface «network interface name» mtu=#### store=persistent

Where «network interface name» is your specific network adapter name as obtained above (or viewable under Network adapters), and mtu=#### is the desired MTU value.

For example, if the name of your network card is «Wireless Network Connection» and you’d like to set its MTU to 1500, you’d have to type:

netsh interface ipv4 set subinterface «Wireless Network Connection» mtu=1500 store=persistent

Note: The maximum MTU value is usually 1500, and up to 1492 for PPPoE connections.

Manually tuning Registry Parameters

Many of the registry keys tuning TCP/IP parameters from previous Windows versions no longer work in Vista and Server 2008. Below is a list of the few we’ve confirmed to still work. Note that for changes to these settings to take effect the computer needs to be rebooted. As always, a registry backup is recommended if making any changes, and some proficiency in using regedit is required.

In regedit (Start icon > Run > type: regedit while logged in as administrator), you can navigate and edit the following keys.

MTU (Maximum Transmission Unit) — the maximum packet size.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControl Set\Services\Tcpip\Parameters\Interfaces\ <. >\
MTU=1500 (DWORD, entry does not exist by default)

The <. >part of the above path is the unique identifier of your network adapter. You can recognize the correct adapter by looking at it’s IP address, if obtaining IP automatically labeled by: DhcpIPAddress=192.168.x.x text value, for example.

We recommend leaving this at default, unless you want to lower it. Vista uses the largest possible packet size for the underlying network by default.

Note: In some test environments, the correct MTU entry may be offset by 8. The 8 offset seems to coincide with the size of the PPPoE overhead. Check the result with the TCP Analyzer.

TCP 1323 Options

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControl Set\Services\Tcpip\Parameters\
Tcp1323Opts=1 (DWORD, entry created automatically by Windows when you run the «netsh int tcp set global autotuninglvl=. » command, set to 0 by default).

Setting this seems to have no effect, since auto-tuning uses the TCP 1323 scale factor and changes it on the fly, disregarding this setting. Additional testing may be required to determine it’s effect if auto-tuning is turned off. Setting it to 1 is best for broadband connections.

NetDMA (TCPA)

NetDMA enables support for advanced direct memory access. In essence, it provides the ability to more efficiently move network data by minimizing CPU usage. NetDMA frees the CPU from handling memory data transfers between network card data buffers and application buffers by using a DMA engine.

Under Windows 7, NetDMA can be set directly using the netsh interface (not available under Vista):

netsh int tcp set global netdma=enabled

Under Vista/2008/7, you can set NetDMA/TCPA using the following Registry parameter:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControl Set\Services\Tcpip\Parameters
EnableTCPA=1 (DWORD, not in registry by default. Set to 1 to enable, 0 to disable NetDMA)

Recommended setting is 1 (if not using Chimney Offload), zero otherwise. A new DWORD value may need to be created if not already present in the registry.

For NetDMA to work, it must be enabled in BIOS, your CPU must support Intel I/O Acceleration Technology (I/OAT), and it does not work together with Chimney Offload. More info available -here-

Checksum Offloading (DisableTaskOffload)

This NDIS 5 setting allows for reducing CPU load by offloading some tasks required to maintain the TCP/IP stack to the network card. Theoretically, Widnows should automatically detect capable network hardware.

The tasks offloaded are as follows:
— TCP/IP checksum calculation — each packet sent includes a verification checksum.
— TCP/IP segmentation — also known as «TCP Large Send» where Windows sends a large amount of data to the network card, and the NIC is then responsible for dividing it according to the network MTU. Experimental feature, not enabled by default
— IPSec Encryption cyphers and message digests — provides encryption of packets at the hardware level.

To change the checksum offloading setting in the Windows Registry:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControl Set\Services\Tcpip\Parameters
DisableTaskOffload=0 (DWORD value, default: not set, recommended: 0=enable offload, 1=disable offload)

DefaultTTL

TTL can be safely left alone in many cases. It is a limit to the time and number of hops/routers a packet will travel before being discarded. A number that’s too small risks packets being discarded before reaching their destination. A number that’s too large (over 128) will cause delay in when lost IP packets are discarded.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControl Set\Services\Tcpip\Parameters
DefaultTTL=64 (DWORD, set to a decimal value between 32 and 128. Recommended: 64)

TcpMaxDataRetransmissions

Determines how many times unacknowledged data (non-connect segment) is retransmitted before TCP aborts the connection. The retransmission timeout is doubled with each successive retransmission on a connection. It is reset when responses resume.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControl Set\Services\Tcpip\Parameters
TCPMaxDataRetransmissions=7 (DWORD, recommended: between 3 and 10, not present in registry by default)

Note: When not present in the registry, the default behavior is 255 retransmissions (5 in documentation).

SynAttackProtect

This undocumented setting provides protection against SYN denial of service (DoS) attacks. When enabled, connections timeout sooner if SYN attack is detected. When set at 1, TCPMaxDataRetransmissions can be lowered further.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControl Set\Services\Tcpip\Parameters
SynAttackProtect=1 (DWORD, recommended: 1, not present in registry by default)

Network Throttling Index

By default, Windows Vista/7 implements a network throttling mechanism to restrict the processing of non-multimedia network traffic to 10 packets per millisecond (a bit over 100 Mbits/second). The idea behind such throttling is that processing of network packets can be a resource-intensive task, and it may need to be throttled to give prioritized CPU access to multimedia programs. In some cases, such as Gigabit networks and some online games, for example, it may be benefitial to turn off such throttling all together.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Wi ndows NT\CurrentVersion\Multimedia\SystemProfi le
NetworkThrottlingIndex=ffffffff (DWORD, default: 10 hex, recommended: 10 hex for media sharing, ffffffff for gaming and max throughput, valid range: 1 through 70 decimal or ffffffff to completely disable throttling)

It is only recommended to change this setting in saturated Gigabit LAN environments, where you do not want to give priority to multimedia playback. Reportedly, disabling throttling by using ffffffff can also help reduce ping spikes in some online games.

Notes: Setting is available in Windows 7, Vista (SP1), 2008 Server. Default value is 10 under Windows 7, similar behavior if the setting is not present in the Registry.
Games that may be affected by this throttling: Source Engine games (TF2, Left 4 Dead, CS:S), HoN, CoD, Overlord series.

Set DNS and Hosts Priority

As with previous versions of Windows, one can improve DNS and hostname resolution by increasing the priority of of related services, while keeping their order. This is explained in more defail in our Host Resolution article. Lower numbers mean higher process priority. The corresponding registry settings in Vista are as follows:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControl Set\Services\Tcpip\ServiceProvider
LocalPriority=4 (DWORD, recommended: 4, default: 499) — local names cache
HostsPriority=5 (DWORD, recommended: 5, default: 500) — the HOSTS file
DnsPriority=6 (DWORD, recommended: 6, default: 2000) — DNS
NetbtPriority=7 (DWORD, recommended: 7, default: 2001) — NetBT name resolution, including WINS

TcpTimedWaitDelay (port allocation)

Short lived (ephemeral) TCP/IP ports above 1024 are allocated as needed by the OS. The default Vista values have improved from previous Windows versions, and are usually sufficient under normal load. However, in some instances under heavy load it it may be necessary to adjust the settings below to tweak the availability of user ports requested by an application.

If the default limits are exceeded under heavy loads, the following error may be observed: «address in use: connect exception». By default under Vista (when the values are not presend in the registry), the OS can allocate up to 16384 ephemeral ports above port 1024, and the OS waits for 120 seconds before reclaiming ports after an application closes the TCP connection. This is a considerable improvement over older Windows versions. However, if necessary, the following registry values can be added/edited:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControl Set\Services\Tcpip\Parameters
MaxUserPort=65534 (DWORD, not in the registry by default. Recommended: leave at default, or use a number above 16384 up to 65534 decimal as necessary) — maximum number of ports to use. 1024 is automatically subtracted from entered value to allow for reserved ports under 1024.
TcpTimedWaitDelay=30 (DWORD, not present or 0xffffffff in registry by default. Recommended: 30 decimal, denoting 30 seconds) — time to wait before reclaiming ports, in seconds. Default time before reclaiming ports, if value is at 0xffffffff or not present in the registry is 120 seconds. Just reducing the delay is often sufficient without changing MaxUserPort, as it allows for reusing ports more efficiently.

Ephemeral ports can be checked and changed using netsh as well.

To query the current values, in command prompt, type:
netsh int ipv4 show dynamicportrange tcp (for UDP, use the same command, replacing only «tcp» with «udp» at the end)

To set both the starting, and max user port using netsh, in elevated command prompt run:
netsh int ipv4 set dynamicportrange protocol=tcp start=1025 num=64511 (start=NNN denoting the starting port, and num=NNN denoting the number of ports)

Notes:
By default, dynamic ports are allocated between ports 49152 and 65535 (for a total of 16384 ephemeral ports).
Using netsh allows to set both the starting port and port range. Editing the Registry allows for setting the port range, and the starting port is fixed at 1025. Deleting the MaxUserPort registry entry (or setting it to a value outside the allowed range) causes the OS to revert to using the default values.
Some system processes can install port filters to block certain port ranges. If ephemeral ports run into these filtered port ranges, TCP/IP applications will be unable to bind to any ports.

QoS Reserved Bandwidth

As with Windows XP, nework adapters have a «QoS Packet Scheduler» enabled by default, which reserves 20% of bandwidth by default for QoS applications that request priority traffic. Note this only has effect in the presence of running QoS applications that request priority traffic. Registry value is undocumented for the Vista version of Windows. To customize this setting, in the Windows Registry:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Mic rosoft\Windows\Psched
NonBestEffortLimit=0 (DWORD, not present in the registry by default. Recommended: 0 , possible values between 0 and 100) — indicates the percentage value of reserved bandwidth for QoS applications. Set to 0 to disable.

Notes: This tweak applies only to Windows versions that have Qos Packet Scheduler enabled. It will ONLY have effect in the presense of running QoS applications.

Network Memory Allocation (Event ID 2017 error)

When using Windows Vista/7 to serve many/large files over the local network, it is possible to sometimes run into memory allocation errors related to the Windows share. This can happen with Linux, Mac, or Windows XP clients. When this happens, you can usually see the following error in the Event Viewer System log:

Source: srv
Event ID: 2017
Level: Error
The server was unable to allocate from the system nonpaged pool because the server reached the configured limit for nonpaged pool allocations.

It is also possible to get an error indicating that: «Not enough server storage is available to process this command». To avoid those errors, you need to change the way Windows allocates memory for network services and file sharing. The below settings optimze the machine as a file server so it would allocate resources accordingly. There are two related registry settings:

HKLM\SYSTEM\CurrentControlSet\Control\Se ssion Manager\Memory Management
LargeSystemCache=1 (DWORD, default value: 0, recommended value: 1)

A value of zero above establishes a cache of

8 MB, a value of 1 allows the cache to expand to physical memory minus 4 MB, if needed.

HKLM\SYSTEM\CurrentControlSet\Services\L anmanServer\Parameters
Size=3 (DWORD, default value: 1, recommended value: 3)

Size=1 minimizes used memory
Size=2 balance used memory
Size=3 optimal setting for file sharing and network applications

Note: Even though this tweak is from older Windows server OSes, it works on workstation versions, as well as Windows Vista and 7 (32 and 64 bit).

Gaming Tweak — Disable Nagle’s algorithm

The tweak below allows for tweaking or disabling Nagle’s alogrithm. Disabling «nagling» allows for very small packets to be transferred immediately without delay. Note that disabling Nagle’s algorithm is only recommended for some games, and it may have negative impact on file transfers/throughput. The dafault state (Nagling enabled) improves performance by allowing several small packets to be combined together into a single, larger packet for more efficient transmission. While this improves overall performance and reduces TCP/IP overhead, it may briefly delay transmission of smaller packets. Keep in mind that disabling Nagle’s algorithm may have some negative effect on file transfers, and can only help reduce delay in some games. To implement this tweak, in the registry editor (Start>Run>regedit) find:

This setting configures the maximum number of outstanding ACKs in Windows XP/2003/Vista/2008:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControl Set\Services\Tcpip\Parameters\Interfaces\
There will be multiple NIC interfaces listed there, for example: <1660430c-b14a-4ac2-8f83-b653e83e8297>. Find the correct one with your IP address listed. Under this key, create a new DWORD value:
TcpAckFrequency=1 (DWORD value, 1=disable, 2=default, 2-n=send ACKs if outstanding ACKs before timed interval. Setting not present by default).

For gaming performance, recommended is 1 (disable). For pure throughput and data streaming, you can experiment with values over 2. If you try larger values, just make sure TcpAckFrequency*MTU is less than RWIN, since the sender may stop sending data if RWIN fills witout acknowledgement.

Also, find the following key (if present):
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MS MQ\Parameters
Add a new DWORD value:
TCPNoDelay=1 (DWORD value, 0 to enable Nagle’s algorithm, 1 to disable, not present by default)

To configure the ACK interval timeout (only has effect if nagling is enabled), find the following key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControl Set\Services\Tcpip\Parameters\Interfaces\
TcpDelAckTicks=0 (DWORD value, default=2, 0=disable nagling, 1-6=100-600 ms). Note you can also set this to 1 to reduce the nagle effect from the default of 200ms without disabling it.

Notes:
Reportedly, the above gaming tweak (disabling nagle’s algorithm) can reduce WoW (World of Warcraft) latency by almost half!
XP/2003 needs hotfix or SP2 for it to work (MS KB 815230)
Vista needs hotfix or SP1 for it to work (MS KB 935458)
See also: NetworkThrottlingIndex setting above

SG TCP Optimizer (version 3.x)

The TCP Optimizer version 3.x allows for easy application of the above settings under all current Windows versions. This free software provides an intuitive interface for tunning your internet connection, backing up/restoring to the Windows defaults, etc. There is no installation required, you can just save it to the desktop, right-click > run as administrator and choose your settings. More detailed information about all available options is provided in the online documentation, answers to frequently asked questions are available in the Optimizer FAQ, and personalized help is available through our broadband tweaking forum.

For user convenience, we also provide a quick way to apply all optimal values as recommended above using our SG Vista TCP/IP Patch. It allows for tweaking all the above netsh settings and registry values in one simple step (with the exception of the «gaming tweak» section). The patch also provides for easily reverting the settings to their Windows default values. To apply, save to your desktop and run as administrator (right-click -> run as administrator). Click Y when prompted to apply settings.

Note: If for some reason Windows renames the file and adds .txt extension to it, you may have to manually rename it back to have a .cmd (or .bat) extension before running it as administrator.