F14 cpuspeed / ondemand broken?

Adam Williamson awilliam at redhat.com
Mon Jan 3 13:08:30 UTC 2011

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.
Adam Williamson
Fedora QA Community Monkey
IRC: adamw | Fedora Talk: adamwill AT fedoraproject DOT org

More information about the test mailing list