On Thu, 1 Sep 2011, Pierre Ossman wrote:
Have you done any research to validate the usefulness of the
ComparingUpdateTracker? Personally, I found that, in Xvnc, it wasn't
catching very many duplicate updates, and the dupes it was catching
would not have significantly slowed down performance (they tended to be
areas of solid color, which the Tight encoder already optimizes out.)
The CUT might be beneficial in cases where an ill-behaved app draws the
same frame over and over again, but that is a corner case, not the
norm.
We've seen issues in the past where the update tracker has solved
things. It has always been crappy applications that keep redrawing the
same thing over and over again. If memory serves me, Java was a bad
offender here.
Peter, do you remember any details?
We have seen that VNC is a great improvement over X11 with Java
applications, but I'm not sure if we have verified if the
ComparingUpdateTracker is causing the improvement or not.
Rgds,
---
Peter Åstrand ThinLinc Chief Developer
Cendio AB http://www.cendio.com
Wallenbergs gata 4
583 30 Linköping Phone: +46-13-21 46 00
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