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What's Been Going On With CPUFreq & The Scheduler

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  • What's Been Going On With CPUFreq & The Scheduler

    Phoronix: What's Been Going On With CPUFreq & The Scheduler

    As we've been covering the past few kernel cycles, a lot of low-level improvements have been happening to CPUFreq with going through a redesign and more plus the introduction of a new CPUFreq governor. If you're behind on this subject matter, here's some slides from this week's LinuxCon event that covers the changes...

    http://www.phoronix.com/scan.php?pag...dutil-And-More

  • #2
    Thanks for sharing this.

    I've just enabled schedutil on both my desktop and my laptop, both AMD based, and I'm actually surprised how much better than ondemand this actually is - *especially* under light load conditions, such as watching video and browsing the web. No more 2.5 GHz when they aren't needed, this keeps the laptop noticably cooler.

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    • #3
      Sounds interesting. Any idea when we can get comparison between kernel versions that compares how this change effects performance? Maybe run video encoding in the background while doing a game performance test and see how it compares?

      Also, CPUFreq uses a scheduler now? Sounds like the next project systemd will absorb. /s

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      • #4
        asking to experts
        which scheduler should i use on my i5-5200u?
        psate powersave or cpufreq schedutil?

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        • #5
          schedutil killed my IO performance compared to tweaked ondemand + io_is_busy

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          • #6
            'schedutil' and Con's BFS don't mix yet.

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            • #7
              Would be interesting to see the comparison of schedutil against ondemand in conjunction with AMD_FREQ_SENSITIVITY

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              • #8
                Originally posted by VikingGe View Post
                Thanks for sharing this.

                I've just enabled schedutil on both my desktop and my laptop, both AMD based, and I'm actually surprised how much better than ondemand this actually is - *especially* under light load conditions, such as watching video and browsing the web. No more 2.5 GHz when they aren't needed, this keeps the laptop noticably cooler.
                Same here, but Intel/Skylake. Playing videos had my CPU 10C cooler compared to pstate.

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                • #9
                  Originally posted by VikingGe View Post
                  Thanks for sharing this.

                  I've just enabled schedutil on both my desktop and my laptop, both AMD based, and I'm actually surprised how much better than ondemand this actually is - *especially* under light load conditions, such as watching video and browsing the web. No more 2.5 GHz when they aren't needed, this keeps the laptop noticably cooler.
                  Sounds interesting. Is there a way to switch to schedutil from the kernel boot parameters instead of recompiling with CPU_FREQ_DEFAULT_GOV_SCHEDUTIL enabled?

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                  • #10
                    Originally posted by halo9en View Post

                    Sounds interesting. Is there a way to switch to schedutil from the kernel boot parameters instead of recompiling with CPU_FREQ_DEFAULT_GOV_SCHEDUTIL enabled?
                    You can change this either with 'cpupower frequency-set -g' or directly writing to /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor. For other CPUs than cpu0 you have to adjust the path or specify with '-c'for cpupower.

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