From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=34546 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1P0WwX-0004zk-AG for qemu-devel@nongnu.org; Tue, 28 Sep 2010 05:57:50 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1P0WwV-0000Yj-WF for qemu-devel@nongnu.org; Tue, 28 Sep 2010 05:57:49 -0400 Received: from mx1.redhat.com ([209.132.183.28]:10199) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1P0WwV-0000Yc-NY for qemu-devel@nongnu.org; Tue, 28 Sep 2010 05:57:47 -0400 Date: Tue, 28 Sep 2010 11:50:58 +0200 From: "Michael S. Tsirkin" Message-ID: <20100928095058.GI12472@redhat.com> References: <20100922171832.GA28721@moo.pl> <4C9A3FAF.9090503@codemonkey.ws> <20100922182049.GA29263@moo.pl> <4C9A4C77.2080806@codemonkey.ws> <20100923140437.GA9256@moo.pl> <20100926154324.GD21843@redhat.com> <20100927213203.GA28089@moo.pl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100927213203.GA28089@moo.pl> Subject: [Qemu-devel] Re: BUG - qdev - partial loss of network connectivity List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Leszek Urbanski Cc: netdev@vger.kernel.org, linux-nfs@vger.kernel.org, qemu-devel@nongnu.org, virtualization@lists.linux-foundation.org On Mon, Sep 27, 2010 at 11:32:03PM +0200, Leszek Urbanski wrote: > <20100926154324.GD21843@redhat.com>; from Michael S. Tsirkin on Sun, Sep 26, 2010 at 17:43:24 +0200 > > > > > >It's vanilla 2.6.32.22, but I also reproduced this on Debian's 2.6.32-23 > > > > >(based on 2.6.32.21). > > > > > > > > > >If offload is the only difference, I'll play with different offload > > > > >options and check which one causes it. > > > > > > > > > > > > > It's not technically the only difference but it's the most likely > > > > culprit IMHO. > > > > > > udp fragmentation offload is definitely the culprit. > > > > I see. Most likely guest bug - won't be the first bug around UFO. > > If so pls copy netdev linux-nfs and virtualization. > > Do you see anything in dmesg? Can try 2.6.36-rc5? > > (for reference: first post is at: > http://lists.nongnu.org/archive/html/qemu-devel/2010-09/msg01685.html ) > > I can't reproduce it on 2.6.36-rc5. Do you have an idea which patch may have > fixed it, or should I dissect? bisect, yes: there were many UFO related patches since 2.6.32. -- MST