[Bug 211305] schedutil selects low P-States on AMD EPYC with frequency invariance
From: <hidden>
Date: 2021-02-15 15:12:08
https://bugzilla.kernel.org/show_bug.cgi?id=211305
--- Comment #17 from Matt McDonald (gardotd426@gmail.com) ---That does seem to have fixed it:
cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_cur_freq
4854354
3823787
3647266
4016171
3576030
3974600
3816628
3590646
3919312
3626692
3618178
3597246
4367040
3599805
3837612
3874146
cat /proc/cpuinfo | grep MHz
cpu MHz : 3800.000
cpu MHz : 3800.000
cpu MHz : 3800.000
cpu MHz : 3800.000
cpu MHz : 3800.000
cpu MHz : 3800.000
cpu MHz : 3800.000
cpu MHz : 3800.000
cpu MHz : 4193.751
cpu MHz : 3800.000
cpu MHz : 3800.000
cpu MHz : 3800.000
cpu MHz : 3800.000
cpu MHz : 3800.000
cpu MHz : 3800.000
cpu MHz : 3800.000
sudo cpupower frequency-info
[sudo] password for matt:
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: Cannot determine or is not supported.
hardware limits: 2.20 GHz - 6.00 GHz
available frequency steps: 3.80 GHz, 2.80 GHz, 2.20 GHz
available cpufreq governors: performance schedutil
current policy: frequency should be within 2.20 GHz and 3.80 GHz.
The governor "performance" may decide which speed to use
within this range.
current CPU frequency: 3.80 GHz (asserted by call to hardware)
boost state support:
Supported: yes
Active: no
Boost States: 0
Total States: 3
Pstate-P0: 1000MHz
Pstate-P1: 700MHz
Pstate-P2: 500MHz
Everything is back to how it should be, only now with assumingly better
schedutil performance (I'll run some benchmarks later). No 6.0GHz reporting and
no being stuck at 2.20GHz. CPU performance under the "performance" governor is
back to where it should be, and I'm boosting up to 4.9-5.0 in single core and
4.8 all-core.
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