From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: Re: Questions about GPLPV stability tests Date: Tue, 29 Nov 2011 19:02:12 -0400 Message-ID: <20111129230212.GA23958@andromeda.dapyr.net> References: <4ED51291.1010308@hfp.de> <4ED5215D.1010403@hfp.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <4ED5215D.1010403@hfp.de> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Andreas Kinzler Cc: Roderick Colenbrander , xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org 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.