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

[Roderick Colenbrander <thunderbird2k@xxxxxxxxx>]

On Wed, Nov 30, 2011 at 12:01 AM, Roderick Colenbrander
<thunderbird2k@xxxxxxxxx> wrote:
> On Tue, Nov 29, 2011 at 3:02 PM, Konrad Rzeszutek Wilk
> <konrad@xxxxxxxxxx> wrote:
>> 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.
>
> I haven't tried Xen 4.1.2 yet. We likely had the issue on Xen 4.0.1
> though our data is not conclusive. Was the Xen 4.1.2 bug you refer to
> also around in Xen 4.0.1?
>
> I'm still preparing our tests. Is there any special logging option
> which would be useful to log anything? All systems are now setup with
> serial consoles and we log Xen and Dom0 to there.
>
> Roderick

It took about a week, but the systems went down again. Linux is down,
but the hypervisor is still reachable on the serial console. Is there
anything interesting to dump from there?

Thanks,
Roderick

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