| Registry Hive |
Value |
Type |
Data |
Purpose(s) |
| HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\parameters |
KeepAliveTime |
REG_DWORD |
180000 |
Determines how often TCP sends keep-alive transmissions |
| HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\parameters |
KeepAliveInterval |
REG_DWORD |
100 |
Determines how often TCP repeats keep-alive transmissions when no response is received |
| HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\parameters |
TcpMaxDataRetransmissions |
REG_DWORD |
10 |
Determines how many times TCP retransmits an unacknowledged data segment on an existing connection |
| HKLM\System\CurrentControlSet\Services\LanmanServer\Parameters |
MaxWorkItems |
REG_DWORD |
512 |
Server Service Optimization |
| HKLM\System\CurrentControlSet\Services\LanmanServer\Parameters |
MaxMpxCt |
REG_DWORD |
2048 |
Server Service Optimization |
| HKLM\System\CurrentControlSet\Services\LanmanServer\Parameters |
MaxFreeConnections |
REG_DWORD |
100 |
Server Service Optimization |
| HKLM\System\CurrentControlSet\Services\LanmanServer\Parameters |
MinFreeConnections |
REG_DWORD |
32 |
Server Service Optimization |
| HKLM\System\CurrentControlSet\Services\LanmanWorkstation\Parameters |
UtilizeNTCaching |
REG_DWORD |
0 |
Disable Caching |
| HKLM\SYSTEM\CurrentControlSet\Services\MRXSmb\Parameters |
OplocksDisabled |
REG_DWORD |
1 |
Disables Opportunistic Locking |
HLM\SYSTEM\CurrentControlSet\Services\Lanmanworkstation\Parameters |
UseOpportunisticLocking |
REG_DWORD |
0 |
Disables Opportunistic Locking |
| HKLM\SYSTEM\CurrentControlSet\Services\Lanmanserver\Parameters |
EnableOplocks |
REG_DWORD |
0 |
Disables Opportunistic Locking |
| HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\parameters |
EnableRSS |
REG_DWORD |
0 |
Disable Receive Side Scaling |
| HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\parameters |
EnableTCPA |
REG_DWORD |
0 |
Disable TCP-acceleration |
| HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\parameters |
EnableTCPChimney |
REG_DWORD |
0 |
Disable TCP Chimney Offload |
| HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters |
DisableBandwidthThrottling |
REG_DWORD |
1 |
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 |
| HKLM\System\CurrentControlSet\Services\LanmanWorkstation\Parameters |
MaxThreads |
REG_DWORD |
17 |
Maximum Concurrent Threads |
| HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters |
DisableLargeMtu |
REG_DWORD |
0 |
The default is 1. By default, the SMB redirector does not transfer payloads larger than approximately 64 KB per request. Setting this registry value to 0 enables larger request sizes, which can improve file transfer speed. |
| HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\parameters |
EnableWsd |
REG_DWORD |
0 |
The default is 1 for client operating systems. By default, Windows Scaling Diagnostics (WSD) automatically disables TCP receive window auto tuning when heuristics suspect a network switch component might not support the required TCP option (scaling). Setting this registry setting to 0 disables this heuristic and allows auto tuning to stay enabled. When no faulty networking devices are involved, applying the setting can enable more reliable high-throughput networking via TCP receive window auto tuning. For more information about disabling this setting |
| HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters |
FileInfoCacheEntriesMax |
REG_DWORD |
32768 |
The default is 64 with a valid range of 1 to 65536. This value is used to determine the amount of file metadata that can be cached by the client. Increasing the value can reduce network traffic and increase performance when a large number of files are accessed |
| HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters |
DirectoryCacheEntriesMax |
REG_DWORD |
4096 |
The default is 16 with a valid range of 1 to 4096. This value is used to determine the amount of directory information that can be cached by the client. Increasing the value can reduce network traffic and increase performance when large directories are accessed |
| HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters |
FileNotFoundCacheEntriesMax |
REG_DWORD |
32768 |
The default is 128 with a valid range of 1 to 65536. This value is used to determine the amount of file name information that can be cached by the client. Increasing the value can reduce network traffic and increase performance when a large number of file names are accessed. |
| HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters |
MaxCmds |
REG_DWORD |
32768 |
The default is 15. This parameter limits the number of outstanding requests on a session. Increasing the value can use more memory, but can improve performance by enabling deeper request pipelining. Increasing the value in conjunction with MaxMpxCt can also eliminate errors encountered due to large numbers of outstanding long-term file requests, such as FindFirstChangeNotification calls. This parameter does not affect connections with SMB 2 servers. |
