[Bug 218022] New: CONFIG_CPU_FREQ_GOV_SCHEDUTIL - 10%-12% reduced performance in lower priority processes on ADL Intel processors.

[Bug 218022] New: CONFIG_CPU_FREQ_GOV_SCHEDUTIL - 10%-12% reduced performance in lower priority processes on ADL Intel processors.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=218022

            Bug ID: 218022
           Summary: CONFIG_CPU_FREQ_GOV_SCHEDUTIL - 10%-12% reduced
                    performance in lower priority processes on ADL Intel
                    processors.
           Product: Power Management
           Version: 2.5
          Hardware: Intel
                OS: Linux
            Status: NEW
          Severity: high
          Priority: P3
         Component: cpufreq
          Assignee: linux-pm@vger.kernel.org
          Reporter: ionut_n2001@yahoo.com
        Regression: No

Hi,

I have noticed for some days, working on an Intel ADL system, that certain
processes are not processed correctly at certain low frequencies, and the
return in frequency causes the applications to go under glitches.

How could I test to see if there are problems from the scheduler, C-state or
intel_pstate?

CPU: 12th Gen Intel(R) Core(TM) i7-1260P

5.15.0-1042-intel-iotg (5.15.122) Ubuntu OS

From what I see on ADL the performances are relatively good, but with C-state
disabled they are improved quite a lot.

-  processor.max_cstate=0 intel.max_cstate=0 processor_idle.max_cstate=0
intel_idle.max_cstate=0

cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-5.15.0-1042-intel-iotg
root=UUID=d52175e7-4bd5-4a56-891f-f5961006330f ro processor.max_cstate=0
intel.max_cstate=0 processor_idle.max_cstate=0 intel_idle.max_cstate=0 quiet
splash vt.handoff=7

With all parameters in cmdline, the system becomes stable.

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[Bug 218022] CONFIG_CPU_FREQ_GOV_SCHEDUTIL - 10%-12% reduced performance in lower priority processes on ADL Intel processors.

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https://bugzilla.kernel.org/show_bug.cgi?id=218022

sander44 (ionut_n2001@yahoo.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|                            |5.15.122

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[Bug 218022] CONFIG_CPU_FREQ_GOV_SCHEDUTIL - 10%-12% reduced performance in lower priority processes on ADL Intel processors.

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https://bugzilla.kernel.org/show_bug.cgi?id=218022

--- Comment #1 from Artem S. Tashkinov (aros@gmx.com) ---
> "reduced performance"

Compared to what?

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[Bug 218022] CONFIG_CPU_FREQ_GOV_SCHEDUTIL - 10%-12% reduced performance in lower priority processes on ADL Intel processors.

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https://bugzilla.kernel.org/show_bug.cgi?id=218022

--- Comment #2 from sander44 (ionut_n2001@yahoo.com) ---
I compared with Intel TGL.

Do you know some tools with which I could check this performance problem in
more detail?

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[Bug 218022] CONFIG_CPU_FREQ_GOV_SCHEDUTIL - 10%-12% reduced performance in lower priority processes on ADL Intel processors.

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https://bugzilla.kernel.org/show_bug.cgi?id=218022

--- Comment #3 from Artem S. Tashkinov (aros@gmx.com) ---
You cannot compare different CPU families.

Speaking of:

> certain processes are not processed correctly at certain low frequencies, and
> the return in frequency causes the applications to go under glitches

Could you please elaborate on that?

Please describe in details what's going on, why it's not working the way it
should and how it should work. And which tools you've used to figure it all
out.

And lastly it would be great if you tested kernel 6.5.7 or 6.6-rc6.

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[Bug 218022] CONFIG_CPU_FREQ_GOV_SCHEDUTIL - 10%-12% reduced performance in lower priority processes on ADL Intel processors.

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https://bugzilla.kernel.org/show_bug.cgi?id=218022

--- Comment #4 from sander44 (ionut_n2001@yahoo.com) ---



I have this:

https://community.frame.work/t/tracking-hard-freezing-on-fedora-36-with-the-new-12th-gen-system/20675?page=18


6.1.7-200.fc37.x86_64 / 12th Gen Intel(R) Core™ i7-1260P

No i915 tunnings! But with intel_idle.max_cstate=2 while booting

With this Since 6.1.17 – I have started getting hangs – but w/o the garbled
screens and trash and garbage on my screens. Garble screen hangs will,
seemingly, eliminated with intel_idle.max_cstate=2.

With 6.1.17, I started to just getting freezes/hangs; no garbled screens.

So maybe in my situation I did have some problems related the sleep states; but
now perhaps I am now also bumping into the intel GPU issues many have noted
here:

booting now with: intel_idle.max_cstate=2 i915.enable_psr=0

I seem to have some stability back.

NOTE: There is maybe some correlation between this (new to me) hang and Zoom
with web cam active. Too early to tell at this point.

HTH

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[Bug 218022] CONFIG_CPU_FREQ_GOV_SCHEDUTIL - 10%-12% reduced performance in lower priority processes on ADL Intel processors.

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--- Comment #5 from Artem S. Tashkinov (aros@gmx.com) ---
Your bug reports was about the diminished performance (which you're still yet
to reveal how you measured) now you're talking about freezes. I've kinda lost
the plot.

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[Bug 218022] CONFIG_CPU_FREQ_GOV_SCHEDUTIL - 10%-12% reduced performance in lower priority processes on ADL Intel processors.

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--- Comment #6 from Artem S. Tashkinov (aros@gmx.com) ---
If you have issues with graphics, here's the proper bug tracker:
https://gitlab.freedesktop.org/drm/intel/-/issues

In a _new_ bug report it would be nice if you specified which kernels worked
for you and which now don't.

You'll be asked to test vanilla kernel, that's without Ubuntu/Fedora patches.

Distro kernels normally are not supported here.

Fedora 38 (after updates) is now rocking Linux 6.5.7, would be nice if you gave
it a try.

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[Bug 218022] CONFIG_CPU_FREQ_GOV_SCHEDUTIL - 10%-12% reduced performance in lower priority processes on ADL Intel processors.

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https://bugzilla.kernel.org/show_bug.cgi?id=218022

Artem S. Tashkinov (aros@gmx.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |ANSWERED

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