I have several apps that repaint the same area of the screen repeatedly.
I'm not sure if this is a case where ComparingUpdateTracker would be used,
but they are all IC CAD tools that draw a bird's eye view of the individual
layers (here's and example screenshot: http://www.mbeckler.org/cadence_plot/).
In reality it seems like a poor implementation by the vendors because
rather than drawing everything to an off-screen pixmap and then painting the
window one time, they all seem to paint each layer from the bottom up. This
gets really painful to watch as the number of layers displayed increases,
and (as you would expect) is exacerbated in proportion to the connection
speed.
Although I don't see it as a vnc problem, I would say that this and
scrolling in applications like firefox are the two areas where Xvnc
performance is the worst. I'm happy to be a test monkey for patches if
anyone has suggestions for improvement.
-brian
On Thu, Sep 1, 2011 at 6:29 AM, Peter Åstrand <astr...@cendio.se> wrote:
> 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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