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spl-time: Use KeQueryPerformanceCounter instead of KeQueryTickCount #326

Merged
merged 2 commits into from
Nov 10, 2023
Merged

spl-time: Use KeQueryPerformanceCounter instead of KeQueryTickCount #326

merged 2 commits into from
Nov 10, 2023

Commits on Nov 10, 2023

  1. spl-time: Use KeQueryPerformanceCounter instead of KeQueryTickCount 

    `KeQueryTickCount` seems to only have a 15.625ms resolution unless the
interrupt timer frequency is increased, which should be avoided due to
power usage.

Instead, this switches the `zfs_lbolt`, `gethrtime` and
`random_get_bytes` to use `KeQueryPerformanceCounter`.

On my system this gives a 100ns resolution.

Signed-off-by: Axel Gembe <[email protected]>
    @EchterAgo
    EchterAgo committed Nov 10, 2023
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  2. spl-time: Add assertion to gethrtime and cache NANOSEC / freq division 

    One less division for each call.

Signed-off-by: Axel Gembe <[email protected]>
    @EchterAgo
    EchterAgo committed Nov 10, 2023
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