The AMD Zen 2 / Zen 3 Performance Fix For Linux 5.11 Has Landed

[intelfx]

It's already been merged into linux-next.

https://git.kernel.org/pub/scm/linux...014354fb6fb7a5

Oh well. Papering over the paper-over the paper-over.

[intelfx]

There's a link there to the bugzilla bug report, but it's just the original one about the poor performance mentioned in these articles on Phoronix, the discussion about this happens toward the end.

Tangential:

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.

What's your setup? What did you do to reach these frequencies?

I have a 5950X, with one of the most capable air coolers. Using stress(1) as load, and limiting to 1 CCX (to be equivalent to your 5800X), the most I can do is ~4.4 GHz all-core and ~4.7-4.8 GHz single-core.

[eduard9900]

Is there anything I can do to get schedutil working within proper range? Or should I use performance or ondemand until this is fixed?


cpupower frequency-info
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 - 6.31 GHz
available frequency steps: 6.31 GHz, 3.80 GHz, 2.80 GHz, 2.20 GHz
available cpufreq governors: conservative ondemand userspace powersave performance schedutil
current policy: frequency should be within 2.20 GHz and 4.79 GHz.
The governor "schedutil" may decide which speed to use
within this range.
current CPU frequency: Unable to call hardware
current CPU frequency: 2.52 GHz (asserted by call to kernel)
boost state support:
Supported: yes
Active: no



cat /proc/cpuinfo | grep MHz
cpu MHz : 2200.000
cpu MHz : 2200.000
cpu MHz : 2200.000
cpu MHz : 2200.000
cpu MHz : 2200.000
cpu MHz : 2200.000
cpu MHz : 2200.000
cpu MHz : 4090.813
cpu MHz : 2200.000
cpu MHz : 2200.000
cpu MHz : 2200.000
cpu MHz : 2200.000
cpu MHz : 2200.000
cpu MHz : 6312.304
cpu MHz : 2200.000
cpu MHz : 2200.000
cpu MHz : 3448.092
cpu MHz : 5874.414
cpu MHz : 3800.000
cpu MHz : 5288.085
cpu MHz : 2200.000
cpu MHz : 2200.000
cpu MHz : 2200.347
cpu MHz : 2200.000


cat /sys/devices/system/cpu/cpufreq/policy0/cpuinfo_max_freq
6312304