Microsoft KB Archive/102969

= REG: Server Service Entries, PART 2 =

Article ID: 102969

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Workstation 3.1
 * Microsoft Windows NT Advanced Server 3.1

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This article was previously published under Q102969



SUMMARY
The article contains REGISTRY entries for the Server service, Part 2. There are no subgroups.

This is the second of two articles on these entries; for the other entries, see "Server Service Entries, Part 1".

SERVER SERVICE ENTRIES
With Registry Editor, you can modify the startup parameters for the Server service. Unless otherwise noted, these parameters are found in this path:   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet \Services\LanmanServer\Parameters The parameters that control network bindings for this service are described in the article on "NetRules Subkey Entries."

This is the second of two articles on these entries; for the other entries, see Server Service Entries, Part 1. MinFreeConnections  REG_DWORD   2 to 5 items - Default: (depends upon configuration) Specifies the minimum number of free connection blocks maintained per endpoint. MinFreeWorkItems  REG_DWORD   0 to 10 items

Default: 2 Specifies the minimum number of available receive work items that are needed for the server to begin processing a potentially blocking SMB. A larger value for this parameter ensures that work items are available more frequently for nonblocking requests, but it also increases the likelihood that blocking requests will be rejected. MinKeepSearch  REG_DWORD   5 to 5000 seconds - Default: 480 Specifies the minimum amount of time that the server will keep incomplete MS DOS searches, even if more search entries are needed. This parameter only matters when the server is near the maximum number of open searches it is allowed. MinLinkThroughput  REG_DWORD   0 to infinite bytes per second -- Default: 0 Specifies the minimum link throughput allowed by the server before it disables raw and opportunistic locks for this connection. MinRcvQueue  REG_DWORD   0 to 10 items --- Default: 2 Specifies the minimum number of free receive work items needed by the server before it begins allocating more. A larger value for this parameter helps ensure that there will always be work items available, but a value that is too large is simply inefficient. NetworkErrorThreshold  REG_DWORD   1 to 100 percent

Default: 5 percent Triggers an alert whenever the percentage of failing network operations relative to total network operations exceeds this value during the AlertSched interval. NumBlockThreads  REG_DWORD   1 to 10 threads - Default: (depends on configuration) Specifies the number of threads set aside by the server to service requests that can block the thread for a significant amount of time. Larger values can increase performance but use more memory. A value that is too large can impede performance by causing excessive task switching. OpenSearch  REG_DWORD   1 to 2048 searches --- Default: 2048 Specifies the maximum number of outstanding searches on the server, per connection. A single client can have up to the OpenSearch number of active searches. This includes all types of searches, including MS- DOS, OS/2, and Windows NT. OplockBreakWait  REG_DWORD   10 to 180 seconds --- Default: 35 Specifies the time that the server waits for a client to respond to an oplock break request. Smaller values can allow detection of crashed clients more quickly but can potentially cause loss of cached data. RawWorkItems  REG_DWORD   1 to 512 items - Default: (depends on configuration) Specifies the number of special work items for raw I/O that the server uses. A larger value for this parameter can increase performance but costs more memory. ScavTimeout  REG_DWORD   1 to 300 seconds -- Default: 30 Specifies the time that the scavenger remains idle before waking up to service requests. A smaller value for this parameter improves the response of the server to various events but costs CPU cycles. ScavQosInfoUpdateTime  REG_DWORD   0 to 100,000 seconds

Default: 300 Specifies the time that can pass before the scavenger goes through the list of active connections to update the link information. SessConns  REG_DWORD   1 to 2048 connections - Default: 2048 Specifies the maximum number of tree connections that can be made on the server via a single virtual circuit. <pre class="fixed_text">SessOpens  REG_DWORD   1 to 2048 files --- Default: 2048 Specifies the maximum number of files that can be open on a single virtual circuit. <pre class="fixed_text">SessUsers  REG_DWORD   1 to 64 users - Default: 32 Specifies the maximum number of users that can be logged on to a server via a single virtual circuit. <pre class="fixed_text">SizReqBuf  REG_DWORD   512 to 65536 bytes -- Default: 4356 Specifies the size of request buffers that the server uses. Small buffers use less memory; large buffers may improve performance. <pre class="fixed_text">ThreadCountAdd  REG_DWORD   0 to 10 threads

Default: (depends on configuration) The server uses one worker thread per processor for the computer it is running on. This parameter indicates how many additional threads the server should use. More threads can improve performance but cost memory. Too many threads can hurt performance by causing excessive task switching. <pre class="fixed_text">ThreadPriority  REG_DWORD   0, 1, 2, or 15 --- Default: 1 Specifies the priority of all server threads in relation to the base priority of the process. Higher priority can give better server performance at the cost of local responsiveness. Lower priority balances server needs with the needs of other processes on the system. Values 0 to 2 are relative to normal or background processes. The default value of 1 is equivalent to the foreground process. A value of 15 runs the server threads at real-time priority-which is not recommended. <pre class="fixed_text">Users  REG_DWORD   1 to infinite - Default: 0xFFFFFFFF (infinite) Specifies the maximum number of users that can be simultaneously logged on to the server. <pre class="fixed_text">XactMemSize  REG_DWORD   64 KB to 16 MB0 - Default: 1 MB Specifies the maximum amount of virtual memory used by the Xactsrv service. A larger value for this parameter helps ensure that memory is available for downlevel clients but costs virtual address space and potentially costs pageable memory.

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