From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andreas Kinzler Subject: Re: serious performance regression in Xen 4.2.4 and 4.2.5 Date: Thu, 19 Feb 2015 17:24:44 +0100 Message-ID: <54E60E4C.3000407@posteo.de> References: <54E5C421.2060109@posteo.de> <54E5C703.7080703@citrix.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <54E5C703.7080703@citrix.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: andrew Cooper , xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org On 19.02.2015 12:20, Andrew Cooper wrote: >Is it perhaps >http://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=f1e0df14412ccc6933a68eda66ac5b7d89186b62 >There are a number of correctness fixes in that range which will >adversely affect performance. I now reverted: http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=f1e0df14412ccc6933a68eda66ac5b7d89186b62 http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=644e6c5c7106d276fb750daf6e07de0034b2e76a http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=0fffcffeb594741d5027c8c0d05900b951f997b2 and benchmark times improve but are no longer reproducable (either 3:36 or 5:09 instead of 6:xx with untouched 4.2.4). Xen 4.3.3/4.4.1/4.5.0 have performance nearly identical to 4.2.3. System: Mainboard Supermicro X9SCM-F, BIOS 2.1 Adaptec 5405, one Raid 0 Xeon E3-1230 16 GB ECC non-registered dom0 kernel is mostly vanilla 3.10.44 VT-d is turned off in the BIOS "linux compile" HVM has 2 vCPUs and 2000 MB RAM Regards Andreas