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AMD Schedutil vs. Performance Governor Benchmarks On Linux 5.11 Shows More Upside Potential

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  • #11
    When will they just give this up already? It's been years and years, and still sucks, and beyond still being bad, it's trying to replace options that are actually good. Performance, powersave, even ondemand. Schedutil is just overcomplicated and underperforming.

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    • #12
      Schedutil was about as fast as ondemand in the last PHX benchmarks I've seen. The performance varied based on the specific tests but overall I think that schedutil even came out slightly ahead. With the recent improvements it'd probably outperform ondemand. If they manage to fix the utilization calculation properly for 5.12 I'd be an interesting benchmark.

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      • #13
        Why can't Linux enter the 21th century and implement continuous integration like everyone else? Obviously you can't test everything but some regressions are simply too obvious to be ignored.
        ## VGA ##
        AMD: X1950XTX, HD3870, HD5870
        Intel: GMA45, HD3000 (Core i5 2500K)

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        • #14
          Originally posted by andrei_me View Post

          My gut feeling is better idle efficiency
          No, idle power usage is the same. P-state scheduling doesn't affect C-states. Efficiency might be a bit better with some "spiky" loads with many wakeups, but still lots of idle time, though.

          Overall... I'm still not impressed by schedutil, not at all. A CPPC2 based scheduler has some intrinsic advantages and should result in some actually tangible differences. Hope we'll see it some day.

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          • #15
            As I suspected. Not impressed.
            Idle power not changed, working power not optimized (beside actual loss of performance),
            too many corner cases and just adding code.
            Nope.
            Will still run performance thank you.

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            • #16
              How can I enable schedutil on Intel? It doesn't appear in the available governors list (using both kernel 5.4 and 5.10).

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              • #17
                Originally posted by Vistaus View Post
                How can I enable schedutil on Intel? It doesn't appear in the available governors list (using both kernel 5.4 and 5.10).
                intel_pstate=passive in the kernel boot parameter list

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                • #18
                  Originally posted by ciupenhauer View Post

                  intel_pstate=passive in the kernel boot parameter list
                  Thanks, I tried that, but schedutil still doesn't appear in the list of available governors.

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                  • #19
                    Originally posted by Vistaus View Post
                    schedutil still doesn't appear in the list of available governors
                    Check if it is enabled in your kernel:

                    Code:
                    zcat /proc/config.gz | grep SCHEDUTIL
                    CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL=y 
                    CONFIG_CPU_FREQ_GOV_SCHEDUTIL=y

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                    • #20
                      I want a CPU governor that ignores "nice" load.

                      Edit: Some searching later:

                      Code:
                      echo 1 | sudo tee/sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load
                      Last edited by andreano; 29 January 2021, 03:17 PM.

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