From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yann Dupont Subject: Re: massive performance drop after a while when using virtio nics Date: Tue, 09 Sep 2008 13:54:12 +0200 Message-ID: <48C663E4.2000006@univ-nantes.fr> References: <1219519317.2909.12.camel@decade.local> <1220955720.12615.28.camel@muff> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Fabian Deutsch , kvm@vger.kernel.org To: Mark McLoughlin Return-path: Received: from Smtp2.univ-nantes.fr ([193.52.82.19]:38384 "EHLO smtp2.univ-nantes.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753275AbYIILyO (ORCPT ); Tue, 9 Sep 2008 07:54:14 -0400 In-Reply-To: <1220955720.12615.28.camel@muff> Sender: kvm-owner@vger.kernel.org List-ID: Mark McLoughlin a =E9crit : > Hi, > > On Sat, 2008-08-23 at 21:21 +0200, Fabian Deutsch wrote: > =20 >> Hey. >> >> When running a guest in the following setup, I observ a "massive" >> performance decrease after a couple of gigabytes of transfrerred dat= a. >> >> other guests keep running fine (no regressions) and nothing unusual = is >> observed on the host. >> =20 > > If you do "killall -ALRM qemu-kvm" after the slowdown has occurred, d= oes > it make things speed up again for a while? > > =20 Too soon to say if it works for us as it seems the problem is long to=20 trigger in our case ; Anyway as the problem seems similar, it's good to= =20 know it is probably fixed. > If so, the issue is fixed by: > > http://git.kernel.org/?p=3Dlinux/kernel/git/torvalds/linux-2.6.git;= a=3Dcommitdiff;h=3Dba661292a2bc6ddd305a212b0526e5dc22195fe7 > > It also got applied in 2.6.26.3 and 2.6.25.16. > > =20 Ok, so upgrading the kernel is sufficient ? > Cheers, > Mark. > > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > > =20 Thanks for the answer, greetings, --=20 Yann Dupont - Service IRTS, DSI Universit=E9 de Nantes Tel : 02.51.12.53.91 - Mail/Jabber : Yann.Dupont@univ-nantes.fr