On Sunday 03 April 2005 11:48 pm, Brad Templeton wrote: > On Sun, Apr 03, 2005 at 08:51:50PM -0500, Pete wrote: > > I'd like to know what I can do get that kind of performance. I've got an > > Athlon XP 3000 (512 MB RAM) and an FX 5200 (AGP) running myth .17 and > > FC3 (everything is from atrpms) where HD is close, but not quite. After > > a lot of hacking to get the channels to work, it finally comes up, but > > I'm getting lousy performance, with a lot of audio buffer underrun's > > (using spdif through an on board nvidia audio chip) and video stutter's. > > We should try to build a list of all the things that can go wrong in > making HD work smoothly. There are many. > > They include: > > > a) Right drivers for card with your kernel > b) Proper AGP bus speed and AGP interface driver in use > c) Proper user of openGL sync for retrace > d) Proper settings for deinterlace and, if used, xvmc > e) Proper sound settings and handling of 5.1 sound and multiple streams > f) Real time scheduling of playback thread > g) Making sure disk or network speed is adequate > h) Nothing else sucking up CPU on the machine > > And of course having the right cards and memory itself.
I have found in my set that raising the write internal buffering helps too. I like to bump the standard write buffer to 8MB, and HD to 16MB, each 4x what the current code is at. Seems to help reduce Buffer Overflows when there are a lot of streams all writing to the same network nfs drive (even for gigabit networks). NFS is not real efficient at streaming large volumes of data. _______________________________________________ mythtv-users mailing list mythtv-users@mythtv.org http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
