[LAU] Hardware timers?

Roger gurusonic at gmail.com
Wed Sep 2 14:40:52 CEST 2020

On 2/9/20 9:53 pm, Edgar Aichinger wrote:
> Am Mittwoch, 2. September 2020, 07:18:39 CEST schrieb david:
>> I don't remember what I did on my old i7 to keep it on performance. One
>> involved having to push the performance setting to EACH CPU/thread, I
>> think that's covered on that link somewhere. May have been a script. I
>> don't remember how I did it, but it stuck between boots. I think I
>> actually tried three different things, so I really don't know which one
>> did the trick.
> As far as I remember for SysV intit systems the way to make the scaling governor persistent across reboots was to put a command into /etc/init.d/boot.local or some other boot init script. The command would vary with distros, whether they used cpufreq-utils or the newer cpupower suite for this. For cpupower, the command would be "/usr/bin/cpupower -c all frequency-set -g performance".
> Systems using systemd would accordingly need a service file added as /etc/systemd/system/cpupower.service, and possibly enabled before it would be run at every boot. I post mine, which I remember having created myself, but I don't remember where I got it from. Anyway this works well for me:
> ----
> [Unit]
> Description=CPU powersave
> [Service]
> Type=oneshot
> ExecStart=/usr/bin/cpupower -c all frequency-set -g performance
> [Install]
> WantedBy=multi-user.target
> ----

That's good info. I've noticed performance governor doesn't fix the cpu to max frequency like it used to but varies a little eg. 2.8-3.17GHz on my nominal 3.16GHz cpu. Still doesn't decrease right down as it does with ondemand governor. Scaling driver is still acpi-cpufreq though.

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