Re: Cpufreq: powernow-k7 weirdness

[Ducrot Bruno <ducrot@poupinou.org>]

On Sun, Jul 06, 2003 at 10:43:05AM -0700, Carl Thompson wrote:
> Quoting Jay Goodman Tamboli <jay@tamboli.cx>:
> 
> > ...
> 
> > Yeah, I found this in 2.4.21-ac4, too, and was having
> > crashes.  Fixing this bug still causes lockups if I change
> > the cpufreq too drastically.  Going from one setting to the
> > next (i.e. not skipping any available speeds) seems to work
> > ok, though.  This is a Sony FR130, so is this the effect of
> > the PST problems discussed earlier?
> 
> No.  This is a problem I discovered a while back during testing of my CPU
> speed setting daemon (see the list archives).  It's just that some CPUs /
> chipsets require smooth rather than drastic transitions.  (In other words,
> when switching from speed X to speed Y, you should switch to every speed in
> between during the transition instead of directly.)  I believe only Mobile
> AMD chips have this behavior.  I believe 2.5 has a fix in for this?  Also,
> yy program automatically handles this for you when switching speeds; I will
> definitely post a version today.
> 

Things should be a little bit more smooth, but there is still deadlock
when for example you switch from max freq. to min.

-- 
Ducrot Bruno

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.