Date: Thu, 5 Apr 2012 13:28:41 +0300 From: Ivan Klymenko <fidaj@ukr.net> To: Volodymyr Kostyrko <c.kworr@gmail.com> Cc: =?UTF-8?B?0JvRjtCx0L7QvNC40YAg0JPRgNC40LPQvtGA0L7Qsg==?= <nm.knife@gmail.com>, freebsd-stable@freebsd.org Subject: Re: lowest C-state changes Message-ID: <20120405132841.3c14625f@nonamehost.> In-Reply-To: <4F7D70C7.60105@gmail.com> References: <CAHi1Jscju7t1PdZa7yjY6kKK0tAuqwc8GUidO3e8o=P__BybQA@mail.gmail.com> <4F7D70C7.60105@gmail.com>
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=D0=92 Thu, 05 Apr 2012 13:15:35 +0300 Volodymyr Kostyrko <c.kworr@gmail.com> =D0=BF=D0=B8=D1=88=D0=B5=D1=82: > =D0=9B=D1=8E=D0=B1=D0=BE=D0=BC=D0=B8=D1=80 =D0=93=D1=80=D0=B8=D0=B3=D0=BE= =D1=80=D0=BE=D0=B2 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=3DC3 > > dev.cpu.1.cx_lowest=3DC3 > > dev.cpu.2.cx_lowest=3DC3 > > dev.cpu.0.cx_lowest=3DC3 > > > > In /etc/rc.conf > > powerd_enable=3D"YES" > > powerd_flags=3D"-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? > > >=20 > Have you checked http://wiki.freebsd.org/TuningPowerConsumption? >=20 > 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). >=20 > 2. You don't need to set each processor CX value, you only need to > set: >=20 > hw.acpi.cpu.cx_lowest=3DC3 >=20 > All cpu's will inherit default profile. >=20 First need to see what state the processor supports the current system sysctl -a | grep cx_
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