From mboxrd@z Thu Jan 1 00:00:00 1970 From: Malcolm Crossley Subject: Re: 4.1.2 very slow without upstream patches, but fast with them, also 4.2 very slow Date: Mon, 6 Aug 2012 13:41:07 +0100 Message-ID: <501FBB63.3050309@citrix.com> References: <501F98A1.4070806@brockmann-consult.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <501F98A1.4070806@brockmann-consult.de> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org On 06/08/12 11:12, Peter Maloney wrote: > my AMD FX-8150 system with vanilla source code is super slow, both the > dom0 and domUs. However, after I merge the upstream patches I found in > the openSUSE rpm, it runs normally. > > I tried 4.2-unstable and it was the same. There was no rc1 when I tested > it about 1.5 weeks ago. And 4.2 has the same horrible performance, and > obviously those patches won't work any more since the 4.2 code looks > completely reorganized, so I'm stuck with 4.1.2 > > Here is the rpm I was using at the time: > http://download.opensuse.org/update/12.1/src/xen-4.1.2_16-1.7.1.src.rpm > > To see the list of the patches and what order to apply them, see the > spec file. > > Please make sure this performance issue is fixed for the 4.2 release. > And I would be happy to test whatever files you send me. > > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xen.org > http://lists.xen.org/xen-devel I suspect you may need the following patch to improve your 4.1.2 performance: http://xenbits.xen.org/hg/xen-4.1-testing.hg/rev/435493696053 The cache flush on every C2 transition is very expensive and causes a large slow down. 4.1.3-rc3 already includes that patch so it would be worth testing that version. Malcolm