From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: Re: Poor performance with Linux 3.x as dom0 Date: Mon, 7 May 2012 15:48:51 -0400 Message-ID: <20120507194851.GA17718@phenom.dumpdata.com> References: <4FA1328B.6070602@hfp.de> <1335965470.26758.58.camel@zakaz.uk.xensource.com> <4FA2615C.1000301@hfp.de> <1336042317.20716.40.camel@zakaz.uk.xensource.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <1336042317.20716.40.camel@zakaz.uk.xensource.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: Ian Campbell Cc: Jeremy Fitzhardinge , "xen-devel@lists.xensource.com" , Andreas Kinzler List-Id: xen-devel@lists.xenproject.org On Thu, May 03, 2012 at 11:51:57AM +0100, Ian Campbell wrote: > On Thu, 2012-05-03 at 11:43 +0100, Andreas Kinzler wrote: > > On 02.05.2012 15:31, Ian Campbell wrote: > > > Did you happen to also compare 3.2.12 and 2.6.34.10 running these > > > workloads natively? > > > > Yes, I tested against 2.6.32.x. Differences exist, but are minor. > > Good to know, thanks for testing > > The other potential Xen perf thing which just occurred to to me is the > ACPI power management stuff which the xen-acpi-processor patches in > 3.4-rcN are fixing. These are necessary to enable things like turbo mode > so have a pretty large perf impact. > > Are you able to try the latest 3.4-rc kernel? > > I'm not sure if backports to the kernels you are running exist or not, > Konrad? No. But they should be easy to cherry-pick. However, I would suggest trying v3.4-rc6 first and seeing if that makes a difference. > > Ian.