From: Paulo Marques <pmarques@grupopie.com>
To: Lee Revell <rlrevell@joe-job.com>
Cc: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
Andi Kleen <ak@suse.de>,
akpm@osdl.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Add p4-clockmod driver in x86-64
Date: Wed, 27 Oct 2004 17:14:35 +0100 [thread overview]
Message-ID: <417FC96B.8030402@grupopie.com> (raw)
In-Reply-To: <1098892587.8313.5.camel@krustophenia.net>
Lee Revell wrote:
> On Wed, 2004-10-27 at 15:59 +0100, Paulo Marques wrote:
>
>>I am one of the members of the robotic soccer team from the University
>>of Oporto, and a couple of months ago we were looking for new
>>motherboards for our robots, because we are starting to need new
>>hardware (on-board lan, usb2.0, etc.).
>>
>>We really don't need excepcional performance, but we really, really need
>>low power consumption, so lowering the clock on a standard mainboard
>>seemed to be the best cost/performance scenario.
>>
>>Could this driver be used to keep a standard p4 processor at say 25%
>>clock speed at all times?
>>
>
>
> Why don't you try the VIA EPIA mini-ITX boards? These are designed for
> low power applications like yours. I am running the M-6000 which has a
> fanless 600Mhz C3 processor, the newer fanless models run at 1Ghz. And,
> on top of that they support speed scaling so you can slow it down even
> more.
Yes, we tried those, but floating point calculations completely kill the
performance on those boards.
Even at 25% speed a P4 2.8GHz gives a 700MHz clock which completely
toasts a 600MHz (or even a 1GHz) C3 in floating point calculations... :(
Even more, I can get a Asus mainboard with integrated VGA, LAN, USB,
Audio, for half the price of a VIA EPIA mini-ITX with comparable integer
performance. As we always have to buy these things in quantities of 5,
this can make some difference.
--
Paulo Marques - www.grupopie.com
All that is necessary for the triumph of evil is that good men do nothing.
Edmund Burke (1729 - 1797)
next prev parent reply other threads:[~2004-10-27 16:16 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-27 14:43 [PATCH] Add p4-clockmod driver in x86-64 Pallipadi, Venkatesh
2004-10-27 14:59 ` Paulo Marques
2004-10-27 15:56 ` Lee Revell
2004-10-27 16:14 ` Paulo Marques [this message]
2004-10-27 16:22 ` Alan Cox
2004-10-27 18:47 ` Marcus Metzler
2004-10-27 21:38 ` Rutger Nijlunsing
2004-10-27 21:50 ` Alan Cox
2004-10-28 0:17 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2004-10-27 16:39 Pallipadi, Venkatesh
2004-10-26 21:28 Venkatesh Pallipadi
2004-10-27 3:18 ` Andi Kleen
2004-10-28 0:10 ` Andi Kleen
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