Re: Improved Intel Turbo Boost status/control

В Mon, 12 Mar 2012 22:11:28 +0200
Alexander Motin <mav_at_FreeBSD.org> пишет:

> On 03/12/12 22:05, Ivan Klymenko wrote:
> > В Mon, 12 Mar 2012 21:55:21 +0200
> > Alexander Motin<mav_at_FreeBSD.org>  пишет:
> >
> >> On 03/12/12 21:33, Ivan Klymenko wrote:
> >>> В Mon, 12 Mar 2012 21:15:35 +0200
> >>> Alexander Motin<mav_at_FreeBSD.org>   пишет:
> >>>> I'd like to note that recent r232793 change to cpufreq(4) in HEAD
> >>>> opened simple access to the  Intel Turbo Boost status/control.
> >>>> I've found that at least two of my desktop systems (based
> >>>> Nehalem and SandyBridge Core i7s) with enabled Intel Turbo Boost
> >>>> in BIOS it is not use it by default, unless powerd is enabled.
> >>>> And before this change it was difficult to detect/fix.
> >>>>
> >>>> ACPI reports extra performance level with frequency 1MHz above
> >>>> the nominal to control Intel Turbo Boost operation. It is not a
> >>>> bug, but feature:
> >>>> dev.cpu.0.freq_levels: 2934/106000 2933/95000 2800/82000 ...
> >>>> In this case value 2933 means 2.93GHz, but 2934 means 3.2-3.6GHz.
> >>>>
> >>>> After boot with default settings I see:
> >>>> dev.cpu.0.freq: 2933
> >>>> , that means Turbo Boost is disabled.
> >>>>
> >>>> Enabling powerd or just adding to rc.conf
> >>>> performance_cpu_freq="HIGH"
> >>>> enables Turbo Boost and adds extra 10-20% to the system
> >>>> performance.
> >>>>
> >>>> Turbo Boost operation can be monitored in run-time via the PMC
> >>>> with command that prints number or really executed cycles per
> >>>> CPU core: pmcstat -s unhalted-core-cycles -w 1
> >>>>
> >>>
> >>> Thank you very much!
> >>> performance_cpu_freq="HIGH"
> >>> and as this option must be combined with state of the processor C1
> >>> C2 C3?
> >>> performance_cx_lowest="XX"
> >>> economy_cx_lowest="XX"
> >>
> >> The more CPU cores on package are sleeping and the deeper they are
> >> sleeping, the bigger will be boost for remaining active cores.
> >> Without using deeper C-states boost is usually quite small (about
> >> 100-200MHz for desktop chips). Enabling C-states increases it in
> >> few times.
> >>
> >
> > I have a Core i5 c Turbo Boost technology (enabled in BIOS)
> > After the following:
> > sysctl dev.cpu.0.freq_levels
> > dev.cpu.0.freq_levels: 2301/35000 2300/35000 2000/29079 1800/25766
> > 1600/22265 1400/18904 1225/16541 1200/15996 1050/13996 1000/12907
> > 875/11293 800/9956 700/8711 600/7467 500/6222 400/4978 300/3733
> > 200/2489 100/1244
> >
> > performance_cpu_freq="HIGH">>  /etc/rc.conf
> >
> > /etc/rc.d/powerd restart
> >
> > sysctl dev.cpu.0.freq_levels
> > dev.cpu.0.freq_levels: 2301/35000 2300/35000 2000/29079 1800/25766
> > 1600/22265 1400/18904 1225/16541 1200/15996 1050/13996 1000/12907
> > 875/11293 800/9956 700/8711 600/7467 500/6222 400/4978 300/3733
> > 200/2489 100/1244
> >
> > CPU frequency does not rise above 2300 Mhz
> >
> > What am I doing wrong?
> 
> performance_cpu_freq variable handled not by /etc/rc.d/powerd, but 
> /etc/rc.d/power_profile.
> 

ok

I remove and insert power supply unit connector - nothing has changed...

sysctl dev.cpu.0.freq_levels
dev.cpu.0.freq_levels: 2301/35000 2300/35000 2000/29079 1800/25766 1600/22265 1400/18904 1225/16541 1200/15996 1050/13996 1000/12907 875/11293 800/9956 700/8711 600/7467 500/6222 400/4978 300/3733 200/2489 100/1244