Determining acceptable values for counters
[Reviewers: Please check these values.]
In
general, deciding whether or not performance is acceptable is a
subjective judgment that varies significantly with variations in user
environments. The values you establish as the baselines for your
organization are the best basis for comparison. Nevertheless, the
following table containing threshold values for specific counters can
help you determine whether values reported by your computer indicate a
problem. If System Monitor consistently reports these values, it is
likely that bottlenecks exist on your system and you should take action
to tune or upgrade the affected resource.
Disk
|
Physical Disk\% Free Space
Logical Disk\% Free Space
|
15%
|
|
Disk
|
Physical Disk\\% Disk Time
Logical Disk\% Disk Time
|
90%
|
|
Disk
|
Physical Disk\Disk Reads/sec, Physical Disk\Disk Writes/sec
|
Depends on manufacturer's specifications
|
Check
the specified transfer rate for your disks to verify that this rate
doesn't exceed the specifications. In general, Ultra Wide SCSI disks
can handle 50 to 70 I/O operations per second.
|
Disk
|
Physical Disk\Current Disk Queue Length
|
Number of spindles plus 2
|
This
is an instantaneous counter; observe its value over several intervals.
For an average over time, use Physical Disk\Avg. Disk Queue Length.
|
Memory
|
Memory\Available Bytes
|
Less than 4 MB
|
Research memory usage and add memory if needed.
|
Memory
|
Memory\Pages/sec
|
20
|
Research paging activity.
|
Paging File
|
Paging File\% Usage
|
Above 70%
|
Review this value in conjunction with Available Bytes and Pages/sec to understand paging activity on your computer.
|
Processor
|
Processor\% Processor Time
|
85%
|
Find
the process that is using a high percentage of processor time. Upgrade
to a faster processor or install an additional processor.
|
Processor
|
Processor\Interrupts/sec
|
Depends on processor; 1000 interrupts per second is a good starting point
|
A
dramatic increase in this counter value without a corresponding
increase in system activity indicates a hardware problem. Identify the
network adapter causing the interrupts. You might need to install an
additional adapter or controller card.You might need to install an
additional adapter or controller card.
|
Server
|
Server\Bytes Total/sec
|
|
If
the sum of Bytes Total/sec for all servers is roughly equal to the
maximum transfer rates of your network, you may need to segment the
network.
|
Server
|
Server\Work Item Shortages
|
3
|
If the value reaches this threshold, consider adding the DWORD entries InitWorkItems
(the number of work items allocated to a processor during start up) or MaxWorkItems
(the maximum number of receive buffers that a server can allocate) to
the registry (under
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters).
The entry InitWorkItems
can range from 1 to 512 while MaxWorkItems
can range from 1 to 65535. Start with any value for InitWorkItems
and a value of 4096 for MaxWorkItems
and keep doubling these values until the Server\Work Item Shortages
threshold stays below 3. For information about modifying the registry,
see Registry Editor Help
Caution
• |
Incorrectly
editing the registry may severely damage your system. Before making
changes to the registry, you should back up any valued data on the
computer.
|
|
Server
|
Server\Pool Paged Peak
|
Amount of physical RAM
|
This value is an indicator of the maximum paging file size and the amount of physical memory.
|
Server
|
Server Work Queues\Queue Length
|
4
|
If
the value reaches this threshold, there may be a processor bottleneck.
This is an instantaneous counter; observe its value over several
intervals.
|
Multiple Processors
|
System\Processor Queue Length
|
2
|
This is an instantaneous counter; observe its value over several intervals.
|
For tuning and upgrade suggestions, see Solving performance problems
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/sag_mpmonperf_13a.mspx?mfr=true
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