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From: Dominik Brodowski <>
To: Pavel Machek <>
Cc: Wes Felter <>,
	Xavier Bestel <>,
	Linux Kernel Mailing List <>
Subject: Re: HELP: cpufreq on HT and/or SMP systems
Date: Wed, 6 Aug 2003 10:10:46 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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.


      reply	other threads:[~2003-08-06  8:26 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-31 21:53 HELP: cpufreq on HT and/or SMP systems Ricardo Galli
2003-08-01 22:36 ` Wes Felter
2003-08-01 22:51   ` Xavier Bestel
2003-08-01 23:01     ` Wes Felter
2003-08-05 11:16       ` Pavel Machek
2003-08-06  8:10         ` Dominik Brodowski [this message]

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