Re: [Xen-users] Xen 4.3.1 / Linux 3.12 panic

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2013-11-06 at 11:20 +0100, Wouter de Geus wrote:
> * Ian Campbell <Ian.Campbell@xxxxxxxxxx> [2013-11-06 09:41:39 +0000]:
> 
> > The is a cpufreq thing from the looks of it.
> > 
> > cpufreq differences between native Linux and Xen could cause weird
> > memory corruption, manifesting as a variety of page faults, GPFs etc, I
> > guess.
> > 
> > Perhaps investigate disabling cpufreq stuff under Xen? I'm not sure how
> > one does this exactly but google through up
> > http://wiki.xen.org/wiki/Xen_power_management and I saw some references
> > in http://xenbits.xen.org/docs/unstable/misc/xen-command-line.html
> > 
> > Ian.
> 
> Thanks a lot for the insight!
> 
> I've booted my 3.12-Desman kernel under xen with 'cpufreq=none' on the xen
> commandline.  So far so good (trying some kernel compiles to see if it's
> stable, system has been up for 20 minutes now).
> If this turns out to be stable I'll try again with cpufreq=dom0 to see if
> that's also stable. I'll report my findings if you care.

Please do.

I suspect it shouldn't be necessary to use command lines to override
these things, but I've no idea how to diagnose this further.

Once you have the findings if you could post a summary to xen-devel and
CC jbeulich@xxxxxxxx & insong.liu@xxxxxxxxx (cpufreq/power mgmt
maintainers) perhaps they can advise.

Ian.


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