A few weeks back I posted a message about people complaining about VNC
performance over DSL type connections. I appreciated the responses I got.
What I wound up having to do was really drill my customers to find out what
they were really trying to do and what the cause of the problem was. What
it comes down to is that I'm STILL having performance issues, but I
understand them a little better now, and perhaps this community can provide
me with additional guidance.
Ultimately, my customers are trying to run a CAD application from Avant!
called Apollo, and they're doing this on an HP-UX 11.0 platform. The
application does not like it when the VNC X server (on any host, not just
HP) is started using -depth 8 or -depth 24. Apollo complains about not
being able to find a color map.
So, when VNC is started using -cc 3, when Apollo is started, the
performance goes to pot. The VNC viewer cursor gets WELL ahead of the X
cursor.
When I quit from Apollo, the performance gets better.
I've tried looking through the online documentation searching for some
performance tuning mechanisms, but there isn't much there. I've tried a
variety of things on the client side, including the different compression
methods (zlib, tight), restricting pixels to 8bits, etc. and nothing seems
to change the performance of Apollo running through VNC.
Unfortunately, my customers have found that running Exceed, through our
Windows Terminal Server infrastructure results in very high performance.
This doesn't make me, a VNC champion, or my management (who have to pay for
Exceed licenses and the WTS infrastructure) very happy.
I would really like to try and find some methods for closing this
performance gap. Does anyone have any suggestions for ways to improve the
performance of VNC for some applications that appear to be terrible
resource hogs?
- Jeff
--
Jeff Boerio \\ URL: http://www.arocknid.com/boerio/
Sr. Systems Programmer \\
Intel Corporation \\
[EMAIL PROTECTED] //
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