From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rik van Riel Subject: Re: [PATCH][RFC] open HVM backing storage with O_SYNC Date: Wed, 02 Aug 2006 19:26:03 -0400 Message-ID: <44D1348B.9050506@redhat.com> References: <44C9B75B.7060809@redhat.com> <44CA4330.7010007@redhat.com> <44CA71C9.1040408@redhat.com> <3d8eece20607281744u6c134500jab89011d1089198e@mail.gmail.com> <44CD369F.5030908@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <44CD369F.5030908@redhat.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Rik van Riel Cc: xen-devel@lists.xensource.com, Christian.Limpach@cl.cam.ac.uk List-Id: xen-devel@lists.xenproject.org Rik van Riel wrote: > Christian Limpach wrote: >> Any other ideas what could be the bottleneck then? > > Probably scheduling latency. After switching to the rtl8139 network emulation (which now work well), the CPU use of both qemu-dm and my VT guests dramatically decreased and performance is a lot better now. I'll let you know what the next bottleneck is once I run into it :) -- "Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it." - Brian W. Kernighan