lkml.org 
[lkml]   [2010]   [May]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 8/7] cpufreq: make the iowait-is-busy-time a sysfs tunable
On Mon, May 03, 2010 at 08:48:18PM -0700, Arjan van de Ven wrote:
> From: Arjan van de Ven <arjan@linux.intel.com>
> Subject: [PATCH] cpufreq: make the iowait-is-busy-time a sysfs tunable
>
> Pavel Machek pointed out that not all CPUs have an efficient idle
> at high frequency. Specifically, older Intel and various AMD cpus
> would get a higher power usage when copying files from USB.
>
> Mike Chan pointed out that the same is true for various ARM chips
> as well.
>
> Thomas Renninger suggested to make this a sysfs tunable with a
> reasonable default.
>
> This patch adds a sysfs tunable for the new behavior, and uses
> a very simple function to determine a reasonable default, depending
> on the CPU vendor/type.
>
> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
> ---

That's very nice Arjan. That way we'll be able to select between
performance and power savings, which is what most laptop users
want after all !

Thanks,
Willy



\
 
 \ /
  Last update: 2010-05-04 06:21    [W:0.057 / U:18.804 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site