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| author | Chen Yu <[email protected]> | 2021-04-28 02:51:57 +0000 |
|---|---|---|
| committer | Len Brown <[email protected]> | 2021-05-04 23:09:00 +0000 |
| commit | 8c69da293041352d15a2b6e8010c141822a416c5 (patch) | |
| tree | 706505f8c5f4ff450297073735073966161b660e /tools/perf/scripts/python/syscall-counts.py | |
| parent | tools/power turbostat: unmark non-kernel-doc comment (diff) | |
| download | kernel-8c69da293041352d15a2b6e8010c141822a416c5.tar.gz kernel-8c69da293041352d15a2b6e8010c141822a416c5.zip | |
tools/power turbostat: Enable tsc_tweak for Elkhart Lake and Jasper Lake
It was found that on Elkhart Lake the TSC frequency is driven by
a separate crystal-clock domain, which is different from the
BCLK domain which includes mperf. This has result in small different
speed thus inconsistence between TSC and the mperf, which caused the
Busy% to be higher than 100%. On this platform it seems that the mperf
runs faster than tsc when the CPU is 100% utilized:
delta tsc(18815473183) < delta mperf(18958403680) for 10 seconds.
To align TSC with mperf, leverage the tsc_tweak mechanism introduced for
cores newer than Skylake, so that TSC and mperf would be calculated in
the same domain.
Reported-by: Zhang Rui <[email protected]>
Signed-off-by: Chen Yu <[email protected]>
Signed-off-by: Len Brown <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/syscall-counts.py')
0 files changed, 0 insertions, 0 deletions