I'm hitting some odd performance glitch here that I hope someone could
provide some insight in to.
I've been experimenting with getting pixels on the screen as efficiently
as possible in TigerVNC. As part of that I made a test program that
tries to draw things as quickly as possible (some XSync()s thrown in to
avoid queue build-up though).
This looks sane on some systems, but on my workstation I'm getting some
rather odd results:
For small updates I see performance growing logarithmically, measured in
pixels/second. At around 500k pixels it starts leveling off at ~1.5
Gpixels/second. After that the performance starts dropping linearly as
the update grows.
The method uses is XShmPutPixmap(). Splitting up the transfer in to
multiple calls doesn't seem to help.
This is a Fedora 25 with an Intel E3-1200 card. Wayland vs X11 doesn't
seem to matter much.
Ideas?
Regards
--
Pierre Ossman Software Development
Cendio AB https://cendio.com
Teknikringen 8 https://twitter.com/ThinLinc
583 30 Linköping https://facebook.com/ThinLinc
Phone: +46-13-214600 https://plus.google.com/+CendioThinLinc
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
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