From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jacob Gorm Hansen Subject: Re: Poor network performance in domU in unstable Date: Tue, 26 Apr 2005 16:07:21 -0700 Message-ID: <426EC9A9.4010204@diku.dk> References: <426EA4BD.6010004@diku.dk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <426EA4BD.6010004@diku.dk> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Jacob Gorm Hansen Cc: xen-devel List-Id: xen-devel@lists.xenproject.org Jacob Gorm Hansen wrote: > hi, > > with unstable as of April 21st, I am getting fairly bad networking > performance in my domUs, e.g 125Mbits/s TCP with iPerf over a gigabit > link, where dom0 gets around 700Mbits/s. > > This is with a non-debug build of Xen, with a bridged setup created with > vmtools, and both with and without use of grant tables. > > If I run Xen with hyperthreading enabled, the figure improves somewhat, > to 165Mbits/s in domU. > > Is anyone else seeing the same behaviour with unstable? Is there some > magic switch I need to flip (that perhaps vmtools does not know about) > to prevent domain I/O being throttled by Xen? This seems to have been a configuration issue, as instead of migrating my old .config files using the arch/xen/config/* files got domU back to normal performance. Thanks, Jacob