Date: Mon, 11 Aug 2008 17:02:06 +0300
From: Adrian Bunk <bunk@kernel.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: S K <nospamnoham@gmail.com>, Zhao Yakui <yakui.zhao@intel.com>,
       Thomas Renninger <trenn@suse.de>,
       Alan Jenkins <alan-jenkins@tuffmail.co.uk>,
       linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org
Subject: Re: cpufreq doesn't seem to work in Intel Q9300
Message-ID: <20080811140206.GB3338@cs181140183.pp.htv.fi>
References: <514e099a0808030300u140a0ae7m92a2e7294f39f7b7@mail.gmail.com> <200808081430.43012.trenn@suse.de> <aff5deaf0808081123s1fbe6a5cn7847e9cb053c1f5a@mail.gmail.com> <200808092059.47863.trenn@suse.de> <514e099a0808100128u303207clcb22292db2f0cc59@mail.gmail.com> <1218418431.6671.52.camel@yakui_zhao.sh.intel.com> <514e099a0808102144n241c8e9ak255bded0a80744f1@mail.gmail.com> <20080811042244.469f8e1d@infradead.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <20080811042244.469f8e1d@infradead.org>
User-Agent: Mutt/1.5.18 (2008-05-17)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1577
Lines: 41

On Mon, Aug 11, 2008 at 04:22:44AM -0700, Arjan van de Ven wrote:
> On Sun, 10 Aug 2008 21:44:50 -0700
> "S K" <nospamnoham@gmail.com> wrote:
> 
> > > But it is very strange that cpufreq scaling can work on Windows XP.
> > > Will you please try the P4 clock cpufreq driver and see whether the
> > > scaling can work ? In fact P4 clock cpufreq driver is already
> > > replaced by acpi_cpufreq driver for the latest cpu.
> > > Anyway please try p4 clock cpufreq driver.
> > 
> > What is the name of the driver? I'm not able to find any such driver
> > in Fedora 9 installed modules. There is only acpi-cpufreq and
> > powernow-k8.
> 
> yeah don't bother with p4-clockmod, it's not something that saves you
> energy... it only gives you a fake feeling that you would.

This statement is only true for HPC environments and when you measure 
Watts per work done.

But if you have some desktop or server with a load that is determined by 
when it gets used, then p4-clockmod can actually save energy when the 
computer is not under high load or even idle.

Or do I miss anything?

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/