Re: Suspend to RAM regression tracked down

From: Jean-Marc Valin
Date: Fri Jul 07 2006 - 18:47:34 EST


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:
% cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 9
model name : Intel(R) Pentium(R) M processor 1600MHz
stepping : 5
cpu MHz : 598.132
cache size : 1024 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr mce cx8 sep mtrr pge mca cmov
pat clflush dts acpi mmx fxsr sse sse2 tm pbe est tm2
bogomips : 1197.24

BTW, speedstep worked fine on my laptop with 2.6.12-rc5-git5 and
earlier.

> 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.

Jean-Marc
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