Messages in this thread | | | Date | Wed, 6 Aug 2003 10:10:46 +0200 | From | Dominik Brodowski <> | Subject | Re: HELP: cpufreq on HT and/or SMP systems |
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On Tue, Aug 05, 2003 at 01:16:47PM +0200, Pavel Machek wrote: > Hi! > > > > > AFAIK no SMP systems have voltage/frequency scaling (SpeedStep/PowerNow). > > > > I've heard that ACPI P-states works on SMP, but if it's not doing > > > > voltage/frequency scaling then I don't know what it's doing. > > > > > > I've got an ABit VP6 (VIA686, dual P3), and the processors speed and > > > voltage can be set in the BIOS. Does it count ? > > > > I meant dynamic voltage/frequency scaling, so that doesn't count. > > If his bios can change voltage/frequency, kernel can probably do the > same. So his hardware probably can be supported by cpufreq.
The cpufreq core supports SMP. But only a few SMP capable CPUs offer cpu frequency and/or voltage scaling. Those who do (e.g. P4/Xeon, UltraSparc variants, and some ARM processors, IIRC) are well supported by cpufreq.
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