[Bug 215714] New: A huge unnecessary power consumption with CONFIG_X86_ACPI_CPUFREQ

[Bug 215714] New: A huge unnecessary power consumption with CONFIG_X86_ACPI_CPUFREQ

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215714

            Bug ID: 215714
           Summary: A huge unnecessary power consumption with
                    CONFIG_X86_ACPI_CPUFREQ
           Product: Power Management
           Version: 2.5
    Kernel Version: 5.17
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: cpufreq
          Assignee: linux-pm@vger.kernel.org
          Reporter: aros@gmx.com
        Regression: No

So, here's the situation.

I have a Ryzen 5800X CPU.

Whenever I watch a 4K youtube video (VP9 codec, Mozilla Firefox, no GPU
acceleration, decoded and rendered solely by the CPU) with the ACPI_CPUFREQ
driver the power consumption stays around 50-55 Watts while the CPU is
constantly hitting or staying around the maximum turbo frequency (~4.75GHz).

Whenever I disable Turbo Boost (echo 0 >
/sys/devices/system/cpu/cpufreq/boost), the power consumption instantly
deceases to around 39W with no difference in video decoding, i.e. frames are
not dropped, decoding is smooth and steady.

We are talking about a staggering 30% decrease in power consumption just by
disabling Turbo Boost and limiting CPU frequency to 3.8GHz.

I suppose this is not right and should be fixed/addressed.

I'm using the ondemand governor with default settings.

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[Bug 215714] A huge unnecessary power consumption with CONFIG_X86_ACPI_CPUFREQ and ondemand governor

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215714

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|A huge unnecessary power    |A huge unnecessary power
                   |consumption with            |consumption with
                   |CONFIG_X86_ACPI_CPUFREQ     |CONFIG_X86_ACPI_CPUFREQ and
                   |                            |ondemand governor

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[Bug 215714] A huge unnecessary power consumption with CONFIG_X86_ACPI_CPUFREQ and ondemand governor - Ryzen 5800X

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215714

Zhang Rui (rui.zhang@intel.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rui.zhang@intel.com
            Summary|A huge unnecessary power    |A huge unnecessary power
                   |consumption with            |consumption with
                   |CONFIG_X86_ACPI_CPUFREQ and |CONFIG_X86_ACPI_CPUFREQ and
                   |ondemand governor           |ondemand governor - Ryzen
                   |                            |5800X

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[Bug 215714] A huge unnecessary power consumption with CONFIG_X86_ACPI_CPUFREQ and ondemand governor - Ryzen 5800X

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=215714

--- Comment #1 from Artem S. Tashkinov (aros@gmx.com) ---
This is reproducible for other CPUs as well.

Watching HW accelerated videos in Firefox results in ~40% higher power
consumption than necessary to actually play them.

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