https://bugs.freedesktop.org/show_bug.cgi?id=26599
--- Comment #11 from Dave Witbrodt <[email protected]> 2010-05-12 18:12:32 PDT --- [Hmmm, I replied via email yesterday, but apparently that didn't work... since nothing appeared here in 24 hours.] For the record, this bug was about the "vline" feature in the radeon driver, and 'torcs' was merely the metric being used to identify and measure the impact it had on performance. Regarding closing the bug: I assumed that the developers would close the "bug" after Alex identified (in comment #2) that the problem was caused by vline... and it was actually a feature, not a bug. When the bug was NOT closed by any developer, I assumed (maybe wrongly?) that the impact of vline (versus radeon with vline removed) was still of some interest. As a result, I began reporting my results once or twice a month of testing my latest radeon update from git with and without the vline feature. In hindsight, I think this was not a bug; it was true that when vline was first introduced that the 'torcs' track I use for testing went from playable to unplayable. Vline does cause a decrease in max frame rate, but something else got fixed (who knows what? DRM? Mesa?) which rendered 'torcs' playable even with vline. I sympathize with AttilaN, though: one of the programs I use for testing OpenGL performance (prboom) has suffered a horrible performance regression since January or February. The problem is, I've only been testing 'prboom' using one map which doesn't expose the regression. I accidentally played another map a few days ago -- previously perfectly playable -- which was now experiencing performance issues that made it difficult or impossible to play. Wanting to report a bug, I tried a great variety of older packages (from Debian, and locally built from git) -- Linux kernels/DRM, radeon drivers, Mesa libraries, libdrm, X servers -- going as far back as the beginning of March. I was not able to find a combination of old software that made the performance regression disappear. At this point, I'm totally baffled: I don't know when the problems were introduced, or in what software. I also just discovered that a different track in 'torcs' only allows me 5 frames per second (on HD 4850 hardware!), even with vline removed from radeon. I'm afraid I can't locate the cause of these regressions, and for now have given up trying. I guess all I can do is hope the developers are seeing the same problems, and are able to find fixes or workarounds. None of this has much to do with vline, though. If a developer closes this bug, I will understand. If not, I will continue to report here what performance differences I'm seeing in the radeon driver with and without the vline feature. Thanks, Dave W. -- Configure bugmail: https://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
