The DiskPerf subkey entries determines whether disk performance statistics are maintained by the system. If the Start value is 0 (boot), then statistics are counted and are reported by Performance Monitor and similar tools. Collecting disk performance statistics can take up to 1.5 percent of the disk throughput on a system with a slow processor (such as an 20 MHz 80386 computer) but should have negligible impact on a system with a faster processor (such as a 33 MHz i486 and above).
Turn DiskPerf on or off only by using the Diskperf utility; for example, type diskperf -y at the command prompt.
The Registry path is the following:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DiskPerfThere are no parameters that users can set. The following are the default values for the standard entries:
Value entry | Value |
ErrorControl | 0x1 (Normal) |
Group | Filter |
Start | 0x4 (disabled) |
Type | 0x1 (Kernel driver) |