Re: [Xen-devel] Questions about GPLPV stability tests

[Konrad Rzeszutek Wilk <konrad@xxxxxxxxxx>]

On Tue, Nov 29, 2011 at 07:15:57PM +0100, Andreas Kinzler wrote:
> >>Not in this year of my stability tests. In this year I am always
> >>experiencing crashes of domU only. dom0 was always stable.
> >>But last year, I hunted a very serious problem which causes nasty
> >>hangs/crashes in dom0 (which crashes domU as a consequence). See this
> >>mailing list post:
> >>http://lists.xen.org/archives/html/xen-devel/2010-09/msg00556.html
> >>In my tests it clearly shows that if you have a CPU without ARAT and you
> >>don't have the patch from my post, your Xen 4.0.1 or 4.1.1 will crash 
> >>under
> >>load and/or after a while. What is your CPU?
> >Most of our machines use i7 950 CPUs. They don't seem to have ARAT.
> 
> Yes, i7 950 does not have ARAT as it is the first Nehalem generation.
> 
> >Some other machines use Xeon CPUs with ARAT support. We never had
> >issues on the Xeon systems, so we may actually be suffering from the
> >ARAT issue. Are you still using the patch you linked to in a
> >production environment?
> 
> Absolutely. As I mentioned I just re-performed tests recently and found 
> that even Xen 4.1.1 (earlier tests were for 4.0.1) is unstable without 
> my patch on non-ARAT-CPUs.

Did you try 4.1.2? This looks quite similar to one particular bug where
the vectors were not migrated properly.

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