From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1KglCt-0004EP-LC for qemu-devel@nongnu.org; Fri, 19 Sep 2008 14:59:55 -0400 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1KglCr-0004Di-GS for qemu-devel@nongnu.org; Fri, 19 Sep 2008 14:59:54 -0400 Received: from [199.232.76.173] (port=53110 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1KglCr-0004Df-CV for qemu-devel@nongnu.org; Fri, 19 Sep 2008 14:59:53 -0400 Received: from nf-out-0910.google.com ([64.233.182.188]:32814) by monty-python.gnu.org with esmtp (Exim 4.60) (envelope-from ) id 1KglCr-0000oB-8o for qemu-devel@nongnu.org; Fri, 19 Sep 2008 14:59:53 -0400 Received: by nf-out-0910.google.com with SMTP id b2so314588nfb.12 for ; Fri, 19 Sep 2008 11:59:50 -0700 (PDT) Message-ID: <48D3F66D.2080507@codemonkey.ws> Date: Fri, 19 Sep 2008 13:58:53 -0500 From: Anthony Liguori MIME-Version: 1.0 Subject: Re: [Qemu-devel] jumbo frames: needing some help References: <20080919193742.vp0rkod868o0g84o@imap.uni-ulm.de> In-Reply-To: <20080919193742.vp0rkod868o0g84o@imap.uni-ulm.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org martin.rauh@uni-ulm.de wrote: > Hello, everyone! > > Sorry for the inconvenience, but as a part of my diploma thesis, I am > creating a virtual NIC for QEMU, in order to support a new cluster OS > of the university. (Saving the overhead caused by emulating real > hardware, it is not emulating an existing NIC.) Anyway, now it seems > to be working correctly, except for handling jumbo frames, which I > have to make available. You would have to post your patch. We seem to be able to handle jumbo frames nicely with virtio-net. BTW, are you aware of virtio-net? It has all of the properties that you are describing and it already exists for Linux and Windows. Regards, Anthony Liguori > I connected two QEMU instances by -net socket,listen and -net > socket,connect options and I can send and receive packets in the > guests. If I'm sending a 9000 byte packet, or bigger than 4 kByte, it > is received completely by the other instance, but then QEMU crashes. > > I didn't find an according bug in the code of my NIC. > MTU of 127.0.0.1 is 16436... > > Is there something special that I have to take care of, dealing with > jumbo frames? Unfortunately I'm no expert in networking... > > Thank you in advance! > > Regards, > > Martin Rauh. > > > >