From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: Re: Dom0 crash with apache bench (ab) Date: Tue, 28 Jul 2015 10:50:22 -0400 Message-ID: <20150728145022.GE26623@x230.dumpdata.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Christoffer Dall Cc: xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org On Tue, Jul 28, 2015 at 03:09:31PM +0200, Christoffer Dall wrote: > Hi, > > I've been doing some performance comparisons lately, and wanted to compare > the performance overhead of using Xen with apache bench, but unfortunately > the Dom0 kernel crashes when hitting it with ab from a remote machine. > Most other workloads seem to be stable, however, I do see similar crashes > if hitting Dom0 mysql with a mysql benchmark with a high level of > parallelism. > > I use a 10G Mellanox MX354A Dual port FDR CX3 adapter for networking on a > Dell PowerEdge R320 system with a Xeon E5-2450 and 16 GB of RAM. > > Interestingly, we had a similarly looking issue on arm64 recently, but that > was fixed with an APM-soecific fix to the hypervisor, so I am guessing this > is unrelated, see: > http://lists.xenproject.org/archives/html/xen-devel/2015-03/msg02731.html > and the fix: > http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=50dcb3de603927db2fd87ba09e29c817415aaa44 > > I have tried with several Linux versions, v3.13, v3.18, v4.0-rc4, and v4.1, > same issue. I have tried with Xen 4.5-0 release, and the Ubuntu packaged > Xen 4.4 release, same issue. > > Examples of crash: > http://pastebin.ubuntu.com/11953498/ > http://pastebin.ubuntu.com/11953443/ 4.0-rc4? Have you tried 4.1? > > Running DomU with a bridge and running ab against apache running in a DomU > also causes the system to crash. > > Note: The server also has an embedded 1G Broadcom NIC (although not > suitable for testing due to it being 1G and on a control network), and > using that for the test does not cause a system crash, so this points to > some difficulties with the Mellanox device and Xen. > > Any ideas or advice is greatly appreciated, thanks. > > -Christoffer > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xen.org > http://lists.xen.org/xen-devel