Date: Tue, 16 Jul 2024 01:37:41 +0300 From: Anton Shepelev <anton.txt@gmail.com> To: freebsd-questions@freebsd.org Subject: Cannot seem to throttle individual cores with hwpstate_intel Message-ID: <20240716013741.17158bb56952618f8d748515@gmail.com>
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Hello, all.
In order to throttle the Intel Core i3-6006U 2 GHz CPU with
four cores in my laptop, I did the following:
1. made sure hwpstate_intel is installed by:
dmesg | grep hwpstate
2. disabled package-level control, to control the cores
individually:
machdep.hwpstate_pkg_ctrl=0
3. executed the following code:
i=0
epp=0
while [ $i -lt 4 ]; do
sysctl dev.hwpstate_intel.$i.epp=$epp;
epp=100
i=$((i+1));
done
Now, sysctl has:
dev.hwpstate_intel.3.epp: 100
dev.hwpstate_intel.2.epp: 100
dev.hwpstate_intel.1.epp: 100
dev.hwpstate_intel.0.epp: 0
Yet it keeps reporting identical frequencies for all the
four cores even without any heavy load:
dev.cpu.3.freq: 1990
dev.cpu.1.freq: 1990
dev.cpu.2.freq: 1990
dev.cpu.0.freq: 1990
Is it correct behavior? I expected cores 1-3 to have a lower
frequency... Judging by the observable speed and fan noise,
the total throttling seems still to be determine by the
maximum .epp, i.e. that hwpstate_pkg_ctrl has no effect.
How could I verify and (if confimed) fix it?
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