This allows replaying of SMB sessions and is not recommended for security reasons. This adjustment causes the server services to use more memory.ĭescription: Allows SMB to functioning without SMB signing. Setting it to 64 KB has approximately the same effect as Large Write support, which uses 60-KB buffers. Key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Lanmanserver\Parametersĭescription: Controls the buffer size for CORE SMB requests.
#Windows afd buffer defaultreceivewindow update#
When you enable the NoRemoteRecursiveEvents registry entry or the NoRemoteChangeNotify registry entry on a computer that uses a network-based configuration (for example, a %USERPROFILE% variable that points to a network drive or to a UNC path), Windows Explorer does not automatically update the display when file changes or folder changes are made by other users. You must press F5 or click Refresh on the View menu in Windows Explorer to manually update the changes in the current folder of a network share. If you set this value to 1, change notifications on network drives are disabled. Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\PoliciesValueĭescription: A setting of 1 turns off Change Notify requests for file changes and for folder changes on mapped network shares. This issue does not occur until the Explorer.exe window on the client is opened to a share on the server and then closed. This may cause extra traffic over a wide area network (WAN). Key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policiesĭescription: Microsoft Windows NT-based and Microsoft Windows 2000-based servers continue to communicate file system changes to Windows XP-based clients even if an Explorer.exe window is not open on the client. Key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AFD\Parameters Recommended: 1 (window scale enabled only)ĭescription: 0 (disable RFC 1323 options) For highest efficiency, the receive window must be an even multiple of the TCP Maximum Segment Size (MSS). Performance over high (delay * bandwidth) networks. Generally, larger receive windows improve The receive window specifies the number of bytes a sender can transmit without receiving an acknowledgment. OR (The larger of four times the maximum TCP data size on the network OR 8192 rounded up to an even multiple of the network TCP data size.) The default is 8760 for Ethernet.ĭescription: This parameter determines the maximum TCP receive window size of the computer. As long as a connection is in the TIME_WAIT state, the socket pair cannot be re-used.Īccording to RFC793, the value should be two times the maximum segment lifetime on the network. If you set this parameter to 0, an MTU of 576 bytes is used for all connections that are not to computers on the local subnet.ĭescription: This parameter determines the time that a connection stays in the TIME_WAIT state when it is closing. Fragmentation adversely affects TCP throughput and causes network congestion. By discovering the Path MTU and limiting TCP segments to this size, TCP can eliminate fragmentation at routers along the path that connect networks with different MTUs. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\Interfaces\ĭescription: If you set this parameter to 1 (True), TCP tries to discover the Maximum Transmission Unit (MTU or largest packet size) over the path to a remote host. All recommended values below are in decimal. These registry recommendations may have the opposite effect on the network.
All of these registry values are recommended based on default settings and a network with no packet loss. These might include SMB signing, client-side caching, file system, search service, scheduled tasks, NTFS encryption, NTFS compression, IPSEC, and antivirus features.īelow there are some recommendation for TCP/IP and SMB tuning. Please also do not enable any services or features that your particular file server and file client do not require. Netsh interface tcp set global autotuninglevel=disabled Netsh int tcp set global chimney=disabled Please run the following command on the Windows Server 2008 machine to check if the network performance can be improved.
#Windows afd buffer defaultreceivewindow upgrade#
In other words, the best option to increase network performance is to upgrade to Windows Vista. When a user request on a Windows XP SP3 client machine go through to perform file operations over the network on a remote Windows Server 2008 file server, it will use SMB 1.0 protocol to transfer to file.Īs we known, there is no way to significantly improve the performance since there are no plans to implement the necessary technologies into Windows XP. According to the research, I suspect the performance issue is related to SMB 2.0 protocol which is a new network feature in Windows Server 2008.
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