From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andreas Kinzler Subject: Re: Questions about GPLPV stability tests Date: Tue, 29 Nov 2011 18:12:49 +0100 Message-ID: <4ED51291.1010308@hfp.de> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Roderick Colenbrander , xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org On 29.11.2011 16:48, Roderick Colenbrander wrote: > Your tests are heavily stressing DomU. During any of your tests, have > you seen DomU crashing in such a nasty way that Dom0 went down? What > about in production? Our servers use similar software to you > (initially Xen 4.0.1, but now Xen 4.1.1 and a Linux 2.6.32-pvops > kernel), but a few percent of our servers go down in a very nasty way > every day. Dom0 becomes unresponsive, it feels it 'hung' and we have > to force reboot the boxes. Do issues like this sound familiar? 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? Regards Andreas