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Re: [Xen-devel] [PATCH][HVM] remove qemu shadow_vram patch forperformanc

To: Keir Fraser <keir@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH][HVM] remove qemu shadow_vram patch forperformance
From: "Zhai, Edwin" <edwin.zhai@xxxxxxxxx>
Date: Wed, 21 Mar 2007 10:38:50 +0800
Cc: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, "Li, Xin B" <xin.b.li@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "Zhai, Edwin" <edwin.zhai@xxxxxxxxx>
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On Tue, Mar 20, 2007 at 09:45:28AM +0000, Keir Fraser wrote:
> On 20/3/07 09:36, "Li, Xin B" <xin.b.li@xxxxxxxxx> 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,

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