From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir@xensource.com>
Subject: Re: [PATCH][HVM] remove qemu shadow_vram patch
	forperformance
Date: Tue, 20 Mar 2007 09:45:28 +0000
Message-ID: <C2255DB8.BD88%keir@xensource.com>
References: <B30DA1341B0CFA4893EF8A36B40B5C5DE9DD8A@pdsmsx411.ccr.corp.intel.com>
Mime-Version: 1.0
Content-Type: text/plain;
	charset="US-ASCII"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xensource.com>
In-Reply-To: <B30DA1341B0CFA4893EF8A36B40B5C5DE9DD8A@pdsmsx411.ccr.corp.intel.com>
List-Unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xensource.com>
List-Help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-Subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
Sender: xen-devel-bounces@lists.xensource.com
Errors-To: xen-devel-bounces@lists.xensource.com
To: "Li, Xin B" <xin.b.li@intel.com>, "Zhai, Edwin" <edwin.zhai@intel.com>, Keir Fraser <keir@xensource.com>
Cc: Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk>, xen-devel@lists.xensource.com
List-Id: xen-devel@lists.xenproject.org

On 20/3/07 09:36, "Li, Xin B" <xin.b.li@intel.com> 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?

 -- Keir