linux-kernel - Re: cpufreq doesn't seem to work in Intel Q9300

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20080811140206.GB3338@cs181140183.pp.htv.fi>
Date:	Mon, 11 Aug 2008 17:02:06 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	S K <nospamnoham@...il.com>, Zhao Yakui <yakui.zhao@...el.com>,
	Thomas Renninger <trenn@...e.de>,
	Alan Jenkins <alan-jenkins@...fmail.co.uk>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: Re: cpufreq doesn't seem to work in Intel Q9300

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@...il.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@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/