http://bugs.freedesktop.org/show_bug.cgi?id=20505
--- Comment #10 from Fabio <[email protected]> 2009-04-17 09:01:20 PST --- (In reply to comment #9) > (In reply to comment #8) > > Nice but I noticed two problems with my RV530: > > 1) the new attributes have effects only when BICUBIC is 0, but not when > > BICUBIC > > is 2 but disabled because the image is not scaled; > > This is the intended behavior. If bicubic is enabled or auto, I don't enable > the attributes since it would be confusing to have the effects suddenly > disappear when the video gets scaled. The only way to use them is to disable > bicubic (XV_BICUBIC = 0). OK. What about changing the default of the bicubic from auto to no, since it has this limitation (that also confuses users) and it causes slowdown (and also I dislike its smoothing effect)? > > 2) with a small video (512x368) I noticed a 8% speedup (with mplayer > > -benchmark > > -quiet -nosound filename) no matter XV_SYNC, with a larger video (1280x720) > > I > > noticed a slowdown (over 61% and the video is jerkily), unless XV_SYNC is > > disabled, where I get the same performance. But maybe this is a collateral > > effect of the XV_SYNC that must paint all the frames and is noticeable only > > when doing benchmark (i.e. fps > video refresh)? > > > > XV_VSYNC is unrelated to these changes. It will decrease performance in > benchmark type scenarios because it stalls the engine while it waits for the > current vline to pass beyond the video. It's used to avoid tearing. Turn it > off for benchmarking. OK, thanks for clearing this. The strange thing, however, is that before the latest xv merge I got the same performance with or without vsync enabled, while now I get the previous performance only with the vsync disabled and a large slowdown with it enabled. Thanks -- Configure bugmail: http://bugs.freedesktop.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are the assignee for the bug. _______________________________________________ xorg-driver-ati mailing list [email protected] http://lists.x.org/mailman/listinfo/xorg-driver-ati
