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Date: Sat, 12 Dec 2009 11:35:24 -0600
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: [Qemu-devel] Re: Spice and legacy VGA drivers
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To: Izik Eidus <ieidus@redhat.com>
Cc: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

Izik Eidus wrote:
> What you mean? how can it compress it? or what method?
>
> When there is no driver installed, we use compression that based on
> LZ...
>   

Okay, that's what I was asking.  I'm curious because during guest 
installation, I assume that even if you're using QXL, you are still 
stuck in VESA mode.

I'm curious if LZ on it's own is significantly different than some of 
the vnc encodings.  Both ZRLE and Tight have some pre-encoding 
techniques that introduce a palette and in the case of Tight, also 
support efficient gradient encoding.  The idea is that you end up with 
much more compressable data this way.

It's the sort of thing I think would be interesting to measure.  I think 
being able to use VNC style encodings could also be interesting for 
Spice in order to improve this "legacy mode" use-case.

Regards,

Anthony Liguori