Re: [Qemu-devel] [PATCH] vnc: allow fall back to RAW encoding

[Gerd Hoffmann]

On Mo, 2015-08-31 at 10:55 +0200, Peter Lieven wrote:
> Am 28.08.2015 um 13:56 schrieb Gerd Hoffmann:
> > On Do, 2015-08-27 at 14:46 +0200, Peter Lieven wrote:
> >> I have observed that depending on the contents and the encoding it happens
> >> that sending data as RAW sometimes would take less space than the encoded 
> >> data.
> >> This is especially the case for small updates or areas with high color 
> >> images.
> >> If sending RAW encoded data is beneficial allow a fall back to RAW encoding
> >> for the framebuffer update.
> > Do you happen to have some stats for this, especially the "small update"
> > case?  We might want to go straight to raw (without trying other
> > encodings) for small updates, to avoid encoding things twice.
> 
> I had a look at hextile, zrle, tight and zlib encoding. It seems that the case
> that raw encoding is smaller never happens for zrle and tight. For zlib and
> hextile its quite common, but there is no obvious mark for the size of the
> update. It seems to heavily depend on the contents as assumed earlier.

Ok, taking patch as-is then.

cheers,
  Gerd