From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bin Ren Subject: Re: etherbridge bottleneck Date: Thu, 11 Nov 2004 12:00:53 +0000 Message-ID: <8ae78025041111040013a4d891@mail.gmail.com> References: <20041110214845.GU1102@cs.duke.edu> Reply-To: br260@cam.ac.uk Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20041110214845.GU1102@cs.duke.edu> Sender: xen-devel-admin@lists.sourceforge.net Errors-To: xen-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: David Becker Cc: xen-devel@lists.sourceforge.net List-Id: xen-devel@lists.xenproject.org Whenever you see a performance problem, please describe the following things: (1) Is Xen running on a UP, SMP or HT? (2) If Xen is running on a SMP or HT, are xen0 and xenU running different processors or threads? (3) Which scheduler in Xen are you using? Have you changed any parameters? - Bin On Wed, 10 Nov 2004 16:48:45 -0500, David Becker wrote: > > I ran some iperf tests today and it looks like the etherbridge > is the limiting factor on throughput. In the beforetime, I saw great > throughput to the VMs; over 800 Mbps. With the bridge, the numbers > are in the 400s somewhere. > Is this the speed I can expect from the bridge? > Is there some tuning I should try, or another way to get more bandwidth > into the VMs? > > This is with xen-2.0, 2.4.27-xen0 and 2.4.27-xenU. > > My iperf numbers: > 940 Mbps stock linux -> stock linux > 470 Mbps stock linux -> xenU > 533 Mbps xenU -> stock linux > > ether bridge speed > 533 Mbps xenU -> xen0 on the same host > 422 Mbps xen0 -> xenU on the same host > > loopback speed > 4.4 Gbps stock linux > 3.2 Gbps xenU > 3.2 Gbps xen0 > > (stock linux is 2.4.25) > > ------------------------------------------------------- > This SF.Net email is sponsored by: > Sybase ASE Linux Express Edition - download now for FREE > LinuxWorld Reader's Choice Award Winner for best database on Linux. > http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/xen-devel > ------------------------------------------------------- This SF.Net email is sponsored by: Sybase ASE Linux Express Edition - download now for FREE LinuxWorld Reader's Choice Award Winner for best database on Linux. http://ads.osdn.com/?ad_id=5588&alloc_id=12065&op=click