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AMD Posts New "AMD-PSTATE" CPUFreq Driver Leveraging CPPC For Better Perf-Per-Watt

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  • AMD Posts New "AMD-PSTATE" CPUFreq Driver Leveraging CPPC For Better Perf-Per-Watt

    Phoronix: AMD Posts New "AMD-PSTATE" CPUFreq Driver Leveraging CPPC For Better Perf-Per-Watt

    At last! AMD has posted the Linux kernel driver patches for their new "AMD-PSTATE" driver! This driver with modern AMD Zen CPUs (initially limited to Zen 3) to achieve greater performance per Watt / power efficiency on Linux than the conventional ACPI CPUFreq driver...

    https://www.phoronix.com/scan.php?pa...MD-PSTATE-2021

  • #2
    Sounds promising! I can't wait for them to extend it to zen2 so I can try it out with my renoir laptop and in the close future the steamdeck! (Note to others: steamdeck is zen2 and not zen3)

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    • #3
      It's almost like the Valve Index is good for AMD notebook processors on Linux overall.
      Suddenly there is movement on suspend-resume, modern-standby and many other energy efficiency related fixes.

      Hoping this will backport to Renoir soon.

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      • #4
        I preordered a Steam Deck mostly because it's a Linux based system, I don't really need a portable game machine.
        It's nice to see that the project is already helping to improve Linux!

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        • #5
          Considering the Zen3's performance-per-watt was already good, this is a surprising and welcome change.

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          • #6
            How is this useful in the bigger picture? (serious question)
            I thought 'we' are trying to optimize schedutil..

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            • #7
              Is this supposed to land in 5.15 or later? Article doesn't mention

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              • #8
                Originally posted by mppix View Post
                How is this useful in the bigger picture? (serious question)
                I thought 'we' are trying to optimize schedutil..
                It's right there in the patches

                "amd-pstate" leverages the Linux kernel governors such as *schedutil*,
                *ondemand*, etc. to manage the performance hints which are provided by CPPC
                hardware functionality. The first version for amd-pstate is to support one
                of the Zen3 processors, and we will support more in future after we verify
                the hardware and SBIOS functionalities.

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                • #9
                  Originally posted by ciupenhauer View Post
                  Is this supposed to land in 5.15 or later? Article doesn't mention
                  not gonna land for 5.15 - they just got posted! they gotta be reviewed

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                  • #10
                    Originally posted by oskar-n View Post
                    I preordered a Steam Deck mostly because it's a Linux based system, I don't really need a portable game machine.
                    It's nice to see that the project is already helping to improve Linux!
                    With the upcoming dock you can use it as a portable machine when hooked up to a monitor/TV ¯\_(ツ)_/¯

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