Tuning network windows

Network-Related Performance Counters. Performance Tools for Network Workloads. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info.

If the application does not define the receive window size, the link speed determines the size as follows:. For example, on a computer that has a 1-Gbps network adapter installed, the window size should be 64 KB. This feature also makes full use of other features to improve network performance.

By using these features, Windows-based computers can negotiate TCP receive window sizes that are smaller but are scaled at a defined value, depending on the configuration. This behavior the sizes easier to handle for networking devices. You may experience an issue in which the network device is not compliant with the TCP window scale option , as defined in RFC and, therefore, doesn't support the scale factor. In such cases, refer to this KB , Network connectivity fails when you try to use Windows Vista behind a firewall device or contact the Support team for your network device vendor.

You can use either netsh commands or Windows PowerShell cmdlets to review or modify the TCP receive window autotuning level. Unlike in versions of Windows that pre-date Windows 10 or Windows Server , you can no longer use the registry to configure the TCP receive window size.

For more information about the deprecated settings, see Deprecated TCP parameters. For detailed information about the available autotuning levels, see Autotuning levels. For more information about this command, see Netsh commands for Interface Transmission Control Protocol.

You can set receive window autotuning to any of five levels. The default level is Normal. The following table describes the levels. If you use an application to capture network packets, the application should report data that resembles the following for different window autotuning level settings.

The following registry settings from Windows Server are no longer supported, and are ignored in later versions. Examples include firewall and antivirus software. A poorly-written WFP filter can significantly decrease a server's networking performance. For links to all topics in this guide, see Network Subsystem Performance Tuning. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info.

What should I do for TCP settings? Notes Optimizing your TCP window size can be complex as every network is different. Resource: General Introduction See Related topics at the end of this page. What are the best things I should do for performance testing?

When copying a file from one system to another using one TCP session, throughput is significantly lower than doing multiple simultaneous TCP sessions. A few file transfer applications support multiple simultaneous TCP streams.

You can configure these tools to use one or more streams. When copying a file from one system to another, the hard drives of each system can be a significant bottleneck. Systems under test should connect through a full-line rate, non-blocking switch. Select the Link Speed tab and click the Identify Adapter button. Discontinued Products. Show all Show less. Need more help? Feedback will be sent to Microsoft: By pressing the submit button, your feedback will be used to improve Microsoft products and services.

Privacy policy. You can use this topic for an overview of the network subsystem and for links to other topics in this guide. In addition to this topic, the following sections of this guide provide performance tuning recommendations for network devices and the network stack.

Performance tuning the network subsystem, particularly for network intensive workloads, can involve each layer of the network architecture, which is also called the network stack. These layers are broadly divided into the following sections. Network interface.