[mythtv-users] XP2100 outperforms my P4-3.2Ghz
Sonni Nørløv
mythtv-users at sluge.dk
Sun Jan 29 10:18:47 UTC 2006
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.
> Notable differences in systems:
>
> AMD XP2100 proc
> Nvidia FX5200
> Fedora Core 3
> 2.6.10 kernel
> Hauppauge PVR250
>
> P4 3.2Ghz proc
> ATI X300
> Fedora Core 4
> 2.6.14-SMP kernel
> Hauppauge PVR250
>
> Thanks for any help you can offer!
> A
>
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>
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