Performance Tuning on Windows



Recommended Thresholds for the Minimum Set of System Counters

ResourceObject\CounterSuggested ThresholdComments

Disk

LogicalDisk% Free Space

15 percent

None

Disk

LogicalDisk% Disk Time

90 percent

None

Disk

PhysicalDiskDisk Reads/
sec, PhysicalDiskDisk Writes/sec

Depends on manufacturer's specifications

Check
the specified transfer rate for your disks to verify that this rate
does not exceed the specifications. In general, Ultra Wide SCSI disks
can handle 50 to 70 I/O operations per second.

Disk

PhysicalDiskCurrent 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 PhysicalDisk\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.

Network

Network Segment\% Net Utilization

Depends on type of network

You
must determine the threshold based on the type of network you are
running. For Ethernet networks, for example, 30 percent is the
recommended threshold.

Paging File

Paging File\% Usage

Above 70 percent

Review this value in conjunction with Available Bytes and Pages/sec to understand paging activity on your computer.

Processor

Processor\% Processor Time

85 percent

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; for current CPUs, use a threshold of 1500 interrupts per second

A
dramatic increase in this counter value without a corresponding
increase in system activity indicates a hardware problem. Identify the
network adapter or disk controller card causing the interrupts. 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 might need to segment the
network.

Server

Server\Work Item Shortages

3

If
the value reaches this threshold, consider tuning the InitWorkItems or
MaxWorkItems entries in the registry (in HKEY_LOCAL_MACHINE \SYSTEM
\CurrentControlSet
Services\lanmanserver\Parameters). For more
information about MaxWorkItems, see the Microsoft Knowledge Base link
on the
Web Resources page .
Caution Do
not use a registry editor to edit the registry directly unless you have
no alternative. The registry editors bypass the standard safeguards
provided by administrative tools. These safeguards prevent you from
entering conflicting settings or settings that are likely to degrade
performance or damage your system. Editing the registry directly can
have serious, unexpected consequences that can prevent the system from
starting and require that you reinstall Windows 2000. To configure or
customize Windows 2000, use the programs in Control Panel or Microsoft
Management Console whenever possible.

Server

Server Work Queues\Queue Length

4

If
the value reaches this threshold, there might 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.




Some Links:
Server Performance Advisor
Microsoft TechNet: Performance Tuning Checklist 4.5
Computer Performance
Windows 2000 ResKit
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Vittorio Pavesi