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

To: "Li, Xin B" <xin.b.li@xxxxxxxxx>, "Zhai, Edwin" <edwin.zhai@xxxxxxxxx>, Keir Fraser <keir@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH][HVM] remove qemu shadow_vram patch forperformance
From: Keir Fraser <keir@xxxxxxxxxxxxx>
Date: Tue, 20 Mar 2007 09:45:28 +0000
Cc: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
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Thread-topic: [Xen-devel] [PATCH][HVM] remove qemu shadow_vram patch forperformance
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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?

 -- Keir

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