From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Zhai, Edwin" Subject: Re: [PATCH][HVM] remove qemu shadow_vram patch forperformance Date: Wed, 21 Mar 2007 10:38:50 +0800 Message-ID: <20070321023850.GP21485@edwin-srv.sh.intel.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Keir Fraser Cc: Ian Pratt , "Li, Xin B" , xen-devel@lists.xensource.com, "Zhai, Edwin" List-Id: xen-devel@lists.xenproject.org On Tue, Mar 20, 2007 at 09:45:28AM +0000, Keir Fraser wrote: > On 20/3/07 09:36, "Li, Xin B" wrote: > > > The major problem this patch is trying to fix is the performance drop > > when multiple HVM guests are running, and I think we need a better > > solution for this. > > >From my own reading of the code I would have thought that by removing that > SSE memcmp we'd be replacing periodic SSE block memcmp with periodic > pixel-by-pixel comparison (which is what I think we end up doing if we get > past the SSE memcmp?). I'm thinking particularly of the VNC side of things > rather than SDL here, by the way: you guys use SDL most of the time, right? our developer prefer SDL, but our performance data shows that VNS also has such issue, although is a little better than SDL. > > -- Keir > -- best rgds, edwin