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

To: "Zhai, Edwin" <edwin.zhai@xxxxxxxxx>, Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH][HVM] remove qemu shadow_vram patch for performance
From: Keir Fraser <keir@xxxxxxxxxxxxx>
Date: Thu, 15 Mar 2007 10:50:13 +0000
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On 15/3/07 03:30, "Zhai, Edwin" <edwin.zhai@xxxxxxxxx> wrote:

> remove qemu shadow_vram patch and force a whole screen update each time for
> performance.
> W/O this patch, there is huge performance drop in HVM domain when adding other
> guest(windows or linux with xwindow).
> shadow_vram_revert.patch - revert the shadow_vram patch
> shadow_vram_force_update.patch - explictly redraw screen each time

How can updating the whole screen 30 times a second be faster than the
memcmp() that we do currently?

 -- Keir

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