Hi, I think I have see something similar, and it turned out to be related to the opengl driver. On my p3 733mhz, with a similar pvr250 and fx5200 running gentoo, everything was running fine at ~25% idle when watching live tv. Then after an update, including a new nvidia driver, I got prebuffering pauses and 100% cpu usage. After trying to go back to some of the old drivers+packages, which did not change anything. I installed oprofiling and did a bit of profilling I got the following output: Profiling through timer interrupt samples cum. samples % cum. % app name symbol name 4319 4319 41.6249 41.6249 libGLcore.so.1.0.8178 (no symbols) 2193 6512 21.1353 62.7602 libmythtv-0.18.1.so.0.18.1 (no symbols) 1338 7850 12.8951 75.6554 libGL.so.1.0.8178 (no symbols) 1002 8852 9.6569 85.3123 anon (tgid:6743 range:0xb7399000-0xb743c000) (no symbo ls) 296 9148 2.8527 88.1650 libmythavcodec-0.18.1.so.0.18.1 (no symbols) 210 9358 2.0239 90.1889 nvidia (no symbols) 159 9517 1.5324 91.7213 libc-2.3.5.so (no symbols) 44 9561 0.4241 92.1453 vmlinux __do_softirq Which lead me to the opengl driver, then after selecting xorg opengl interface: # opengl-update xorg-x11 Things was back to normal: Profiling through timer interrupt samples cum. samples % cum. % app name symbol name 7732 7732 39.6107 39.6107 vmlinux default_idle 4841 12573 24.8002 64.4109 libmythtv-0.18.1.so.0.18.1 (no symbols) 2983 15556 15.2818 79.6926 anon (tgid:6743 range:0xb7399000-0xb743c000) (no symbo ls) 810 16366 4.1496 83.8422 libmythavcodec-0.18.1.so.0.18.1 (no symbols) 377 16743 1.9314 85.7736 libc-2.3.5.so (no symbols) 296 17039 1.5164 87.2900 vmlinux schedule going back to: # opengl-update nvidia resulted in prebuffering to ocour again. Just my 2 cent. regards Sonni Aaron Aguilar wrote: I had myth setup on a XP2100 processor system and everything worked quite well. Now that I have upgraded to a new computer with a P4 3.2Ghz processor, during live TV, mythfrontend actually uses more of my CPU. Sometimes up to 99%. When this happens I get a prebuffering pause and the video kind of glitches. Anybody ever experience something like this? I have tried changing most of the settings in the setup and didn't see any improvement. I was thinking about trying another kernel or video card, but the video card doesn't seem to be the problem. |
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