Re: IO_APIC NMI Watchdog not handled by suspend/resume.

From: Zwane Mwaikambo
Date: Thu Nov 11 2004 - 20:18:13 EST

On Fri, 12 Nov 2004, Nigel Cunningham wrote:

> On Thu, 2004-11-11 at 10:30, Pavel Machek wrote:
> > Hi!
> >
> > > Tracking down SMP problems, I've found that if you boot with
> > > nmi_watchdog=1 (IO_APIC), the watchdog continues to run while suspend is
> > > doing sensitive things like restoring the original kernel. I don't know
> > > enough to provide a patch to disable it so thought I'd ask if someone
> > > could volunteer to fix this?
> >
> > When we debated this at x86-64 lists, our conclusion was 'critical
> > section should take less than 5 seconds, and watchdog only touches its
> > own variables, so stopping it should not be needed'. [on x86-64,
> > watchdog is enabled even on up].
> I've since decided this too; it turns out that the SMP problems were a
> function of a problem with freezing workthreads, which I've since fixed.
> I have a perfectly stable system now. Which reminds me, since that code
> was merged, I should send the patch to Andy. Will do so shortly.

Could you please Cc me, i (really) wanted to work on that code but got
interrupted by some residence moving.


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