From: Dominik Brodowski <linux@brodo.de>
To: Pavel Machek <pavel@ucw.cz>
Cc: Wes Felter <wesley@felter.org>,
Xavier Bestel <xavier.bestel@free.fr>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: HELP: cpufreq on HT and/or SMP systems
Date: Wed, 6 Aug 2003 10:10:46 +0200 [thread overview]
Message-ID: <20030806081046.GA1993@brodo.de> (raw)
In-Reply-To: <20030805111647.GB329@elf.ucw.cz>
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.
Dominik
prev parent 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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