RE: [Xen-devel] HVM SMP linux guest hangs in cpu_idle() with EFLAGS.IF = 1

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

This may be totally unrelated, but just in case...

Are you using xl to create your problem domains?
If so, you might want to set timer_mode=1 in your
vm.cfg.  (See other xen-devel thread "xen tsc problems".)

> -----Original Message-----
> From: Gianni Tedesco [mailto:gianni.tedesco@xxxxxxxxxx]
> Sent: Tuesday, July 13, 2010 12:13 PM
> To: Konrad Rzeszutek Wilk
> Cc: George Dunlap; Xen Devel
> Subject: Re: [Xen-devel] HVM SMP linux guest hangs in cpu_idle() with
> EFLAGS.IF = 1
> 
> On Tue, 2010-07-13 at 17:31 +0100, Gianni Tedesco wrote:
> > > > I used the same setup to test RHEL5, RHEL5.[1234] and can only
> reproduce
> > > > on 5.1 and 5.2.
> > >
> > > Ok, did you look in the changelog for RHEL5.3 and above. It might
> be
> > > that you are hitting a bug that was fixed.
> >
> > There are several potential candidates but difficult to get further
> info
> > due to redhat bugzilla. Trying to get in touch with a relevant
> engineer
> > to confirm / falsify that theory.
> 
> The patch "Fix gettimeofday reliability issues with TSC, HPET, and
> PM-Timer" seems to mask the bug and make it much less reproducable.
> This
> patch was to fix some gettimeofday-goes-backwards issues on bare metal.
> As a result of this I can now confirm the bug is still present in
> RHEL5.3 at least - I shall test the others shortly.
> 
> Looks like TSC/PIT timesource is either a) unreliable in xen, b)
> unreliable in RHEL kernels or c) all of the above.
> 
> Gianni
> 
> 
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