Любомир Григоров wrote:
Hello all, I am using FreeBSD 9.0-STABLE with Konstantin's patch from March
22nd. Everything else is stock. However, after heavy load, or compiling,
C-states go to C1 as lowest. I think once they pass the threshold, they
don't go back.
ThinkPad X220
i5 2520M with integrated Intel video
In /etc/sysctl.conf
dev.cpu.0.cx_lowest=C3
dev.cpu.1.cx_lowest=C3
dev.cpu.2.cx_lowest=C3
dev.cpu.0.cx_lowest=C3
In /etc/rc.conf
powerd_enable="YES"
powerd_flags="-a hiadaptive -b adaptive -i 85 -r 60 -p 100"
However, once the cores go to C1, they stay there forever, unless I
manually set them all back.
Any idea on this?
Have you checked http://wiki.freebsd.org/TuningPowerConsumption?
1. For CX states to function correctly you better disable throttling and
powerd. I also witnessed at least one machine that hitting any CX mode
stops generate interrupts on APIC clock (I had to boot it with a mousee
until I disabled APIC clocks).
2. You don't need to set each processor CX value, you only need to set:
hw.acpi.cpu.cx_lowest=C3
All cpu's will inherit default profile.
--
Sphinx of black quartz judge my vow.
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