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

[Roderick Colenbrander <thunderbird2k@xxxxxxxxx>]

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

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel