Date: Fri, 11 Sep 2009 07:41:23 +0100 From: Bruce Cran <bruce@cran.org.uk> To: Pierre-Luc Drouin <pldrouin@pldrouin.net> Cc: freebsd-stable@freebsd.org Subject: Re: How to enable CPU turbo mode on FreeBSD? Message-ID: <20090911074123.00006179@unknown> In-Reply-To: <4AA9A07C.4050200@pldrouin.net> References: <4AA9A07C.4050200@pldrouin.net>
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On Thu, 10 Sep 2009 20:57:32 -0400 Pierre-Luc Drouin <pldrouin@pldrouin.net> wrote: > Hi, > > I have an overclocked i7 920 CPU for which I have enabled Turbo Mode > in the BIOS (21x multiplier). The base clock is set at 190 MHz, so > the CPU frequency with Turbo mode activated should be 3990 MHz. > However the maximum value FreeBSD amd64 shows for the CPU frequency > in dmesg and sysctl is 3790 MHz. How can I enable the Turbo Mode? > > CPU: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz (3790.52-MHz > K8-class CPU) > > machdep.acpi_timer_freq: 3579545 > machdep.tsc_freq: 3790522507 > machdep.i8254_freq: 1193182 > dev.cpu.0.freq: 349 > dev.cpu.0.freq_levels: 2793/130000 2443/113750 2094/97500 1745/81250 > 1396/65000 1047/48750 698/32500 349/16250 You may be able to use the cpuctl kernel module with sysutils/x86info to see when the CPUs are using Turbo mode. I haven't had any success yet but I know in Windows the System control panel reported the 2.66GHz CPU running at 2.83GHz without me doing anything, so I guess FreeBSD should be doing the same. -- Bruce Cran
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