Skip to content
Commit 8c69da29 authored by Chen Yu's avatar Chen Yu Committed by Len Brown
Browse files

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: default avatarZhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarChen Yu <yu.c.chen@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 1e3ec5cd
Loading
Loading
Loading
Loading
0% Loading or .
You are about to add 0 people to the discussion. Proceed with caution.
Please to comment