[mythtv] alphapulse caues 100% load but only on 1080p
warpme at o2.pl
Sun Nov 8 16:19:02 UTC 2009
I started to play with main window refresh timer.
Maybe issue is an result of vdpau design.
As for every screen refresh, repainting needs some time, I can imagine
main widow painting frequency level, where time gap between consecutive
paintings is lower that paint processing time. Easy way to verify this
is linear decreasing refresh rate - after some level issue should go away.
I made some tests:
for 1380x720, going from 70 to 45 solves issue (first try; probably
slightly higher is also OK)
for 1920x1080 I have 30=OK, 35=NOK
I made such tests on 8200 IGP with single-channel PC6400 memory.
As we can consider this hardware slowest available hardware with vdpau
(and with slowest processing time), changing mainwindow repaint time to
30 might be worth to consider.
Price for it are not so smooth transitions, but believe more coarse
transitions are less evil than high cpu usage.
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