From mboxrd@z Thu Jan 1 00:00:00 1970 From: Juergen Gross Subject: Re: Poor HVM performance with 8 vcpus Date: Wed, 14 Oct 2009 13:43:45 +0200 Message-ID: <4AD5B971.1040807@ts.fujitsu.com> References: <4ACC3B49.4060500@ts.fujitsu.com> <4ACD907F.7030505@ts.fujitsu.com> <4AD588D9.4040104@ts.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 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: Gianluca Guida Cc: "xen-devel@lists.xensource.com" List-Id: xen-devel@lists.xenproject.org Gianluca Guida wrote: > On Wed, Oct 14, 2009 at 9:16 AM, Juergen Gross > wrote: >> Gianluca, >> >> as the performance of BS2000 seems to be hit by OOS optimization, I'm >> thinking of making a patch to disable this feature by a domain parameter. >> >> Is there a way to do this without having to change all places where the >> #if statements are placed? >> I think there should be some central routines where adding an "if" could >> be enough (setting oos_active to 0 seems not to be enough, I fear). > > It should be. oos_active set to zero (if you prevent the shadow code > to set it to 1 when we enable paging) will prevent any page to go OOS. > This is exactly what Tim's suggestion was. > > Have you tried it? Not yet. I wanted to be sure, as I suspected some inconsistencies could be hiding without showing up at once. Juergen -- Juergen Gross Principal Developer Operating Systems TSP ES&S SWE OS6 Telephone: +49 (0) 89 636 47950 Fujitsu Technolgy Solutions e-mail: juergen.gross@ts.fujitsu.com Otto-Hahn-Ring 6 Internet: ts.fujitsu.com D-81739 Muenchen Company details: ts.fujitsu.com/imprint.html