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| author | He Rongguang <herongguang@linux.alibaba.com> | 2024-12-12 10:14:59 +0800 |
|---|---|---|
| committer | Shuah Khan <skhan@linuxfoundation.org> | 2024-12-16 13:57:12 -0700 |
| commit | 9d6c0e58514f8b57cd9c2c755e41623d6a966025 (patch) | |
| tree | d41f46a59c3b97a826db98752040faccf8c8d3ed /lib/test_overflow.c | |
| parent | 46fd8c707b552c0a846917192f66e623bb03f976 (diff) | |
cpupower: fix TSC MHz calculation
Commit 'cpupower: Make TSC read per CPU for Mperf monitor' (c2adb1877b7)
changes TSC counter reads per cpu, but left time diff global (from start
of all cpus to end of all cpus), thus diff(time) is too large for a
cpu's tsc counting, resulting in far less than acutal TSC_Mhz and thus
`cpupower monitor` showing far less than actual cpu realtime frequency.
/proc/cpuinfo shows frequency:
cat /proc/cpuinfo | egrep -e 'processor' -e 'MHz'
...
processor : 171
cpu MHz : 4108.498
...
before fix (System 100% busy):
| Mperf || Idle_Stats
CPU| C0 | Cx | Freq || POLL | C1 | C2
171| 0.77| 99.23| 2279|| 0.00| 0.00| 0.00
after fix (System 100% busy):
| Mperf || Idle_Stats
CPU| C0 | Cx | Freq || POLL | C1 | C2
171| 0.46| 99.54| 4095|| 0.00| 0.00| 0.00
Fixes: c2adb1877b76 ("cpupower: Make TSC read per CPU for Mperf monitor")
Signed-off-by: He Rongguang <herongguang@linux.alibaba.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Diffstat (limited to 'lib/test_overflow.c')
0 files changed, 0 insertions, 0 deletions