[PATCH 0/5][time][x86_64] GENERIC_TIME patchset for x86_64

john stultz
2006-12-20T01:20:45Z

Andrew, Andi,

I didn't hear any objections (or really, any comments) on my
last release, so as I mentioned then, I want to go ahead and push this
to Andrew for a bit of testing in -mm. Hopefully targeting for
inclusion in 2.6.21 or 2.6.22.

Here's the performance data from the last release:

Vanilla TSC:
149 nsecs per gtod call
367 nsecs per CLOCK_MONOTONIC call
288 nsecs per CLOCK_REALTIME call
Vanilla ACPI PM:
1272 nsecs per gtod call
1335 nsecs per CLOCK_MONOTONIC call
1273 nsecs per CLOCK_REALTIME call

GENERIC_TIME TSC:
149 nsecs per gtod call
304 nsecs per CLOCK_MONOTONIC call
275 nsecs per CLOCK_REALTIME call
GENERIC_TIME ACPI PM:
1273 nsecs per gtod call
1275 nsecs per CLOCK_MONOTONIC call
1273 nsecs per CLOCK_REALTIME call

So almost no performance change.

New in the current C8 release:
o Synced up w/ 2.6.20-rc1
o Added a few small cleanups from Ingo

Let me know if you have any thoughts or comments!

thanks again!
-john