From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44346) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1V8qw0-0004rR-Cz for qemu-devel@nongnu.org; Mon, 12 Aug 2013 08:09:22 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1V8qvr-0003Wv-21 for qemu-devel@nongnu.org; Mon, 12 Aug 2013 08:09:16 -0400 Received: from mx1.redhat.com ([209.132.183.28]:8884) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1V8qvq-0003Wl-QB for qemu-devel@nongnu.org; Mon, 12 Aug 2013 08:09:06 -0400 Date: Mon, 12 Aug 2013 15:10:39 +0300 From: "Michael S. Tsirkin" Message-ID: <20130812121039.GA19889@redhat.com> References: <20130812115739.GA5061@irqsave.net> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline In-Reply-To: <20130812115739.GA5061@irqsave.net> Content-Transfer-Encoding: quoted-printable Subject: Re: [Qemu-devel] virtio-net with vhost RX stall List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: =?iso-8859-1?Q?Beno=EEt?= Canet Cc: qemu-devel@nongnu.org On Mon, Aug 12, 2013 at 01:57:40PM +0200, Beno=EEt Canet wrote: >=20 > Hello, >=20 > I am chasing a randomly occuring RX stall with virtio-net and vhost-net. Any chance the bug is fixed by 'virtio_net: fix race in RX VQ processing'= ? >=20 > So far we have a test setup with a kgdb to debug the guest and a regula= r gdb > to debug QEMU. > We are still trying to reproduce the bug in a test environment. >=20 > Once the bug reproduced would you have hints on what to look for in vir= tio-net > driver state ? > Any idea to debug this would be wellcome. >=20 > Best regards >=20 > Beno=EEt Dump the ring state and index values where they poll, on host and guest. --=20 MST