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SubjectRe: Suspend to RAM regression tracked down
On Sat, Jul 08, 2006 at 08:48:49AM +1000, Jean-Marc Valin wrote:
> Le vendredi 07 juillet 2006 à 12:21 -0400, Dave Jones a écrit :
> > On Fri, Jul 07, 2006 at 09:25:37PM +1000, Jean-Marc Valin wrote:
> > > > There was a race in ondemand and conservative which made them lock up on
> > > > resume (possibly only on SMP systems though). There's a patch for that
> > > > in current -mm, but I suspect there's another problem (still haven't had
> > > > any time to track it down).
> > >
> > > OK, I tried the patch with 2.6.17 and it didn't work. My laptop failed
> > > to resume on the first try, so it must be something else. Could someone
> > > actually have a look at the changes in 2.6.12-rc5-git6 (which happen to
> > > be cpufreq-related)? I spend months pinpointing the problem to that
> > > version (it's takes several days to reproduce). I'd appreciate if
> > > someone could at least have a look at what changed there and maybe fix
> > > it.
> >
> > Can you show /proc/cpuinfo for the affected system ?
> > If it's 15/3/4 or 15/4/1, that would explain why this kernel,
> > as this was when support for those models got introduced to
> > speedstep-centrino.
>
> Not sure what's the 15/..., but here's the content:

it was the family, of which yours is 6, so this isn't it.
which means it must be ..

> > If it's not that, there is a pretty large delta in the ondemand
> > governor in this update, but I don't see anything blindlingly
> > obvious from looking over it.
>
> Well, is there some way of doing a bisection over these changes? As far
> as I know, the problem probably affects all Dell D600 owners, probably
> others.

If you're prepared to play around with 'git bisect' a little, it shouldn't
take that many iterations, as you've already narrowed it down quite a lot.

$ git bisect start drivers/cpufreq/cpufreq_ondemand.c
$ git bisect bad
$ git bisect good v2.6.12-rc5

should get you most of the way there.

http://www.kernel.org/pub/software/scm/git/docs/git-bisect.html
has more info.

Dave

--
http://www.codemonkey.org.uk
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