On Mon, Jan 3, 2011 at 2:08 PM, Adam Williamson <awilliam(a)redhat.com> wrote:
On Fri, 2010-12-31 at 08:49 -0600, Richard Shaw wrote:
> I wish I could find the site where I got this information as my
> recollection of it is a bit hazy but part of your problem may be that
> the p4-clockmod and ondemand are more or less incompatible. I remember
> reading something on kerneltrap or something. Basically the latency of
> changing frequencies are so bad with p4-clockmod that ondemand gives
> up on it or something like that. I think I could force it to work on
> my Celeron based EEEPC by manually setting the governor something like
> this[1]:
yeah, I recall p4-clockmod being called out as problematic in several
ways by some kernel dev or other, but like you I can't recall the
details :/
on my system which wants to use p4-clockmod, I just blacklist it and run
full steam ahead all the time.
And uses _less_ power while doing so.
See:
http://codemonkey.org.uk/2009/01/18/forthcoming-p4clockmod/
In short p4-clockmode is broken by design, don't use it.