From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:35977) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Thlm5-00044X-33 for qemu-devel@nongnu.org; Sun, 09 Dec 2012 13:38:51 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Thlm2-0005gS-CD for qemu-devel@nongnu.org; Sun, 09 Dec 2012 13:38:49 -0500 Received: from mailpro.odiso.net ([89.248.209.98]:53190) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Thlm2-0005eT-3y for qemu-devel@nongnu.org; Sun, 09 Dec 2012 13:38:46 -0500 Date: Sun, 09 Dec 2012 19:38:17 +0100 (CET) From: Alexandre DERUMIER Message-ID: In-Reply-To: <32F34A44-C8C1-4D2C-9295-45BEECC6F7E2@dlhnet.de> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Subject: Re: [Qemu-devel] slow virtio network with vhost=on and multiple cores List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Peter Lieven Cc: "Michael S. Tsirkin" , Stefan Hajnoczi , qemu-devel@nongnu.org, Jan Kiszka , Peter Lieven , Dietmar Maurer >>Have you had any further progress on this regression/problem? Hi Peter, I didn't re-tested myself, but a proxmox user who's have the problem with qemu-kvm 1.2, with windows g= uest and linux guest, don't have the problem anymore with qemu 1.3. http://forum.proxmox.com/threads/12157-Win2003R2-in-KVM-VM-is-slow-in-PVE-2= -2-when-multiply-CPU-cores-allowed I'll try to redone test myself this week Regards, Alexandre ----- Mail original ----- De: "Peter Lieven" =C3=80: "Alexandre DERUMIER" Cc: "Dietmar Maurer" , "Stefan Hajnoczi" , "Jan Kiszka" , qemu-devel@nongnu.org, "Michael = S. Tsirkin" , "Peter Lieven" Envoy=C3=A9: Lundi 3 D=C3=A9cembre 2012 12:23:11 Objet: Re: [Qemu-devel] slow virtio network with vhost=3Don and multiple co= res Am 16.11.2012 um 12:00 schrieb Alexandre DERUMIER : >>> While trying to reproduce the bug, we just detected that it depends on = the hardware (mainboard) you run on. >>> >>> Sigh :-/ > > Hi, > > I can reproduce the bug on all my dell servers,differents generation (R71= 0 (intel),R815 (amd), 2950 (intel). > > They all use broadcom bnx2 network card (don't know if it can be related)= > > host kernel : rhel 63 with 2.6.32 kernel > > guest kernel : 2.6.32 (debian squeeze, ubuntu). > > No problem with guest kernel 3.2 Have you had any further progress on this regression/problem? Thanks, Peter > > > > > ----- Mail original ----- > > De: "Dietmar Maurer" > =C3=80: "Peter Lieven" > Cc: "Stefan Hajnoczi" , "Peter Lieven" = , "Jan Kiszka" , qemu-devel@nongnu.org, "Michael S. Tsir= kin" > Envoy=C3=A9: Vendredi 16 Novembre 2012 11:44:26 > Objet: Re: [Qemu-devel] slow virtio network with vhost=3Don and multiple = cores > >>> I only tested with RHEL6.3 kernel on host. >> >> can you check if there is a difference on interrupt delivery between tho= se >> two? >> >> cat /proc/interrupts should be sufficient after some traffic has flown. = > > While trying to reproduce the bug, we just detected that it depends on th= e hardware (mainboard) you run on. > > Sigh :-/