The default is 32, with a valid range from The maximum number of connections to be established with a single server running Windows Server across all interfaces. The default is seconds.
The maximum time server directory handles held open with directory leases. A known issue in Windows 10, version , affects the ability of Windows 10 to cache large directories.
After you upgrade a computer to Windows 10, version , you access a network share that contains thousands of files and folders, and you open a document that is located on that share. During both of these operations, you experience significant delays.
The default is 10 seconds. This setting controls the length of time in seconds that the redirector will hold on to cached data for a file after the last handle to the file is closed by an application. The default is 0. By default, the SMB redirector throttles throughput across high-latency network connections, in some cases to avoid network-related timeouts.
Setting this registry value to 1 disables this throttling, enabling higher file transfer throughput over high-latency network connections. The default is 0 for Windows 8 only. In Windows 8, the SMB redirector transfers payloads as large as 1 MB per request, which can improve file transfer speed.
Setting this registry value to 1 limits the request size to 64 KB. You should evaluate the impact of this setting before applying it. Here on the Performance Team we constantly deal with issues caused by incorrect performance tuning of various servers. This will generally manifest itself in system or process slowness or memory or CPU bottlenecks. I have decided to publish a short series on basic guidelines you can use when provisioning a new server or tuning an old one.
First, we should address hardware scaling. Windows Server R2 only supports bit processors, so obviously that is the first step. This should not be a problem as bit processors have been widely available for several years and in fact it is difficult to find a server class processor nowadays that is not bit. I personally run bit Windows 7 on my home machines, and I have yet to find a program that I want to use that does not work.
When choosing a processor it is advised to get the most modern version, and the most recent stepping of whichever version you choose.
For instance, in our previous post , we discussed an issue that is mitigated if you use the later stepping of the Intel processor. If you need to achieve the lowest latency, you should request a BIOS version from your hardware provider that reduces SMIs to the lowest degree possible.
The operating system cannot control SMIs because the logical processor is running in a special maintenance mode, which prevents operating system intervention. In earlier versions of Windows, the Windows network stack used a fixed-size receive window 65, bytes that limited the overall potential throughput for connections.
The total achievable throughput of TCP connections could limit network usage scenarios. TCP receive window autotuning enables these scenarios to fully use the network. For a TCP receive window that has a particular size, you can use the following equation to calculate the total throughput of a single connection. For example, for a connection that has a latency of 10 ms, the total achievable throughput is only 51 Mbps.
This value is reasonable for a large corporate network infrastructure. However, by using autotuning to adjust the receive window, the connection can achieve the full line rate of a 1-Gbps connection. Some applications define the size of the TCP receive window. 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 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. 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. Contents Exit focus mode. Is this page helpful? Please rate your experience Yes No. Any additional feedback?
Note Some network adapters require you to enable offload features independently for the send and receive paths. Note If a network adapter does not expose manual resource configuration, either it dynamically configures the resources, or the resources are set to a fixed value that cannot be changed. Note This setting does not work properly if the system BIOS has been set to disable operating system control of power management. Note The operating system cannot control SMIs because the logical processor is running in a special maintenance mode, which prevents operating system intervention.
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