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Re: [Qemu-devel] [PATCH 0 of 3] vnc and vga improvements

From: Anthony Liguori
Subject: Re: [Qemu-devel] [PATCH 0 of 3] vnc and vga improvements
Date: Thu, 28 Aug 2008 15:07:23 -0500
User-agent: Thunderbird (X11/20080723)

Stefano Stabellini wrote:
Hi all,
This is a three patch series coming from xen-unstable to improve vnc
and vga performances.

The first patch implements dynamic colour depth changes in vnc.c:
this way the vnc server can change its own internal colour depth at run
time to follow any guest resolution change.

The second patch implements the WMVi vnc extension in the qemu vnc
server, so that we can also notify a vnc client when we change
internal colour depth and offload any possible colour conversion to the

The third patch implements sharing of the display pixel buffer between
vnc.c and vga.c, in order to save a lot of memcpy's.

The idea is that vnc.c (and in the near future sdl.c too) strictly
follows the guest display resolution and notifies the client of any
change. As a consequence we can save two colour conversions: one between
vga and vnc, another one between the vnc server and the vnc client.

I have mixed feelings about this. On the one hand, reducing the copying is a good thing. On the other hand, we pretty much make it impossible to ever support multiple clients.

I'm going to be travelling tomorrow but I'll look through these patches in more detail over the weekend.


Anthony Liguori

For the moment this is all, but I'll start working on the sdl shared
buffer in the next days.


Stefano Stabellini

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