[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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