lkml.org 
[lkml]   [2004]   [Oct]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] Add p4-clockmod driver in x86-64
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)
-
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/

\
 
 \ /
  Last update: 2005-03-22 14:07    [W:0.093 / U:0.080 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site