Server Work Queues Object

The Server Work Queues performance object consists of counters that monitor the length of queues and objects in the queues.

Counter Name Description Counter Type
Active Threads Shows the number of threads currently working on a request from the server client for this CPU. The system keeps this number as low as possible to minimize unnecessary context switching. This is an instantaneous count for the CPU, not an average over time. PERF_COUNTER_RAWCOUNT
Available Threads Shows the number of server threads on this processor that are not currently working on requests from a client. The server dynamically adjusts the number of threads to maximize server performance. PERF_COUNTER_RAWCOUNT
Available Work Items Shows the instantaneous number of available work items for this CPU. A work item is typically a request from a client to the server; the server maintains a pool of available work items per CPU to speed processing. A sustained near-zero value indicates the need to increase the MinFreeWorkItems registry value for the server service. This value is always 0 in the Blocking Queue instance. PERF_COUNTER_RAWCOUNT
Borrowed Work Items Shows the number of free work items borrowed from another CPU because a CPU ran out of available work items in its pool. An increasing value of this running counter might indicate the need to increase the MaxWorkItems or MinFreeWorkItems registry values for the server service. This value is always 0 in the Blocking Queue instance. PERF_COUNTER_RAWCOUNT
Bytes Received/sec Shows the rate at which the server is receiving bytes from the network clients on this CPU. This value is a measure of how busy the server is. PERF_COUNTER_BULK_COUNT
Bytes Sent/sec Shows the rate at which the server is sending bytes to the network clients on this CPU. This value is a measure of how busy the server is. PERF_COUNTER_BULK_COUNT
Bytes Transferred/sec Shows the rate at which the server is exchanging bytes with the network clients on this CPU. This value is a measure of how busy the server is. PERF_COUNTER_BULK_COUNT
Context Blocks Queued/sec Shows the rate at which work context blocks have to be placed on the server's FSP queue to await server action. PERF_COUNTER_COUNTER
Current Clients Shows the current count of the clients being processed by this CPU. The server actively balances the client load across all of the CPU's in the system. This value is always 0 in the Blocking Queue instance. PERF_COUNTER_RAWCOUNT
Queue Length Shows the current length of the server work queue for this CPU. A sustained queue length greater than four might indicate processor congestion. This is an instantaneous count, not an average over time. PERF_COUNTER_RAWCOUNT
Read Bytes/sec Shows the rate at which the server is reading data from files for the clients on this CPU. This value is a measure of how busy the server is. PERF_COUNTER_BULK_COUNT
Read Operations/sec Shows the rate at which the server is performing file read operations for the clients on this CPU. This value is a measure of how busy the server is. This value is always 0 in the Blocking Queue instance. PERF_COUNTER_BULK_COUNT
Total Bytes/sec Shows the rate at which the server is reading and writing data to and from the files for the clients on this CPU. This value is a measure of how busy the server is. PERF_COUNTER_BULK_COUNT
Total Operations/sec Shows the rate at which the server is performing file read and write operations for the clients on this CPU. This value is a measure of how busy the server is. This value is always 0 in the Blocking Queue instance. PERF_COUNTER_BULK_COUNT
Work Item Shortages Shows the number of times that no work item was available or could be allocated to service the incoming request. A work item is the location where the server stores an SMB. The amount available fluctuate between a minimum and maximum value configured based on how the server is configured and the amount of memory on the computer. If work item shortages are occurring, it may be caused by an overloaded server. If the Work Item Shortages counter value is increasing, consider changing the registry value. HKEY_LOCAL_MACHINE\
SYSTEM\CurrentControlSet\
Services\LanmanServer\Parameters
\Maxworkitems. Allowing this value to be achieved consistently initiates flow control, which hurts performance. This value is always 0 in the Blocking Queue instance.
PERF_COUNTER_RAWCOUNT
Write Bytes/sec Shows the rate at which the server is writing data to files for the clients on this CPU. This value is a measure of how busy the server is. PERF_COUNTER_BULK_COUNT
Write Operations/sec Shows the rate at which the server is performing file write operations for the clients on this CPU. This value is a measure of how busy the server is. This value is always 0 in the Blocking Queue instance. PERF_COUNTER_BULK_COUNT

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