Date: Mon, 12 Mar 2012 22:22:19 +0200 From: Ivan Klymenko <fidaj@ukr.net> To: Alexander Motin <mav@FreeBSD.org> Cc: freebsd-performance@FreeBSD.org, FreeBSD current <freebsd-current@freebsd.org> Subject: Re: Improved Intel Turbo Boost status/control Message-ID: <20120312222219.15fe2101@nonamehost.> In-Reply-To: <4F5E5870.8000600@FreeBSD.org> References: <4F5E4B57.1050605@FreeBSD.org> <4f5e4f82.41972a0a.0e49.2cfdSMTPIN_ADDED@mx.google.com> <4F5E54A9.5050301@FreeBSD.org> <4f5e5730.aa4a440a.4367.ffffa591SMTPIN_ADDED@mx.google.com> <4F5E5870.8000600@FreeBSD.org>
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=D0=92 Mon, 12 Mar 2012 22:11:28 +0200 Alexander Motin <mav@FreeBSD.org> =D0=BF=D0=B8=D1=88=D0=B5=D1=82: > On 03/12/12 22:05, Ivan Klymenko wrote: > > =D0=92 Mon, 12 Mar 2012 21:55:21 +0200 > > Alexander Motin<mav@FreeBSD.org> =D0=BF=D0=B8=D1=88=D0=B5=D1=82: > > > >> On 03/12/12 21:33, Ivan Klymenko wrote: > >>> =D0=92 Mon, 12 Mar 2012 21:15:35 +0200 > >>> Alexander Motin<mav@FreeBSD.org> =D0=BF=D0=B8=D1=88=D0=B5=D1=82: > >>>> 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=3D"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=3D"HIGH" > >>> and as this option must be combined with state of the processor C1 > >>> C2 C3? > >>> performance_cx_lowest=3D"XX" > >>> economy_cx_lowest=3D"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=3D"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? >=20 > performance_cpu_freq variable handled not by /etc/rc.d/powerd, but=20 > /etc/rc.d/power_profile. >=20 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 1600/222= 65 1400/18904 1225/16541 1200/15996 1050/13996 1000/12907 875/11293 800/995= 6 700/8711 600/7467 500/6222 400/4978 300/3733 200/2489 100/1244
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