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 for
	performance
Date: Thu, 15 Mar 2007 10:50:13 +0000
Message-ID: <C21ED565.B88C%keir@xensource.com>
References: <20070315033005.GD12238@edwin-srv.sh.intel.com>
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To: "Zhai, Edwin" <edwin.zhai@intel.com>, Ian Pratt <m+Ian.Pratt@cl.cam.ac.uk>
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On 15/3/07 03:30, "Zhai, Edwin" <edwin.zhai@intel.com> 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