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Hi,<br>
<br>
I think I have see something similar, and it turned out to be related
to the opengl driver.<br>
<br>
On my p3 733mhz, with a similar pvr250 and fx5200 running gentoo,
everything was running fine at ~25% idle when watching live tv.<br>
<br>
Then after an update, including a new nvidia driver, I got prebuffering
pauses and 100% cpu usage.<br>
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:<br>
<tt>Profiling through timer interrupt<br>
samples cum. samples % cum. % app name
symbol name<br>
4319 4319 41.6249 41.6249 libGLcore.so.1.0.8178 (no
symbols)<br>
2193 6512 21.1353 62.7602 libmythtv-0.18.1.so.0.18.1
(no symbols)<br>
1338 7850 12.8951 75.6554 libGL.so.1.0.8178 (no
symbols)<br>
1002 8852 9.6569 85.3123 anon (tgid:6743
range:0xb7399000-0xb743c000) (no symbo<br>
ls)<br>
296 9148 2.8527 88.1650
libmythavcodec-0.18.1.so.0.18.1 (no symbols)<br>
210 9358 2.0239 90.1889 nvidia (no
symbols)<br>
159 9517 1.5324 91.7213 libc-2.3.5.so (no
symbols)<br>
44 9561 0.4241 92.1453 vmlinux
__do_softirq</tt><br>
<br>
Which lead me to the opengl driver, then after selecting xorg opengl
interface:<br>
# opengl-update xorg-x11<br>
<br>
Things was back to normal:<br>
<tt>Profiling through timer interrupt<br>
samples cum. samples % cum. % app name
symbol name<br>
7732 7732 39.6107 39.6107 vmlinux <b>default_idle</b><br>
4841 12573 24.8002 64.4109 libmythtv-0.18.1.so.0.18.1
(no symbols)<br>
2983 15556 15.2818 79.6926 anon (tgid:6743
range:0xb7399000-0xb743c000) (no symbo<br>
ls)<br>
810 16366 4.1496 83.8422
libmythavcodec-0.18.1.so.0.18.1 (no symbols)<br>
377 16743 1.9314 85.7736 libc-2.3.5.so (no
symbols)<br>
296 17039 1.5164 87.2900 vmlinux
schedule<br>
</tt><br>
going back to: <br>
# opengl-update nvidia<br>
resulted in prebuffering to ocour again.<br>
<br>
Just my 2 cent.<br>
<br>
regards<br>
<br>
Sonni<br>
<br>
Aaron Aguilar wrote:
<blockquote
cite="mid203312c30601180634l33187b2am1a305663c2e46321@mail.gmail.com"
type="cite">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.
<br>
Notable differences in systems:<br>
<br>
AMD XP2100 proc<br>
Nvidia FX5200<br>
Fedora Core 3<br>
2.6.10 kernel<br>
Hauppauge PVR250<br>
<br>
P4 3.2Ghz proc<br>
ATI X300 <br>
Fedora Core 4<br>
2.6.14-SMP kernel<br>
Hauppauge PVR250
<br>
<br>
Thanks for any help you can offer!<br>
A<br>
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