From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nivedita Singhvi Subject: Re: performance problems Date: Fri, 04 Feb 2005 09:15:42 -0800 Message-ID: <4203ADBE.2090806@us.ibm.com> References: <20050204142110.GA10313@ruprecht.simpsons.bogus> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit In-Reply-To: <20050204142110.GA10313@ruprecht.simpsons.bogus> 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: Henning Glawe Cc: xen-devel@lists.sourceforge.net List-Id: xen-devel@lists.xenproject.org Henning Glawe wrote: >>It's odd to see such a drop in network performance unless you're on a >>machine with a slow CPU. It should be possible to saturate a Gigabit >>Ethernet (900Mb/s) with a relatively modern CPU. What are you using? > > > its an athlon XP 2100+, so it isn't _so_ slow... > > if someone wants to take a look at the netpipe-tcp results: > http://www.physik.fu-berlin.de/~glaweh/netpipe-xen-benchmark.pdf I took a look at your results. Could you possibly make available any stats that you collected, and your system settings? (netstat -s, sysctl -a, ...) One of the causes for poor performance might be that the virtual domains are unable to utilize the greater bandwidth across the virtual bridge using default socket buffer sizes. Did you bump up the buffer sizes, queue lengths, etc? A little tuning might help and give a clearer picture of the real bottlenecks.. thanks, Nivedita ------------------------------------------------------- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag-&-drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl