[mythtv-users] Unexplainable high CPU while watching MPEG2 - SOLVED (partly)

[Thomas Börkel]

HI!

Found the cause: AGP was disabled!

I am using the 2.6.9 FC2 kernel from atrpms and this kernel has AGPGART 
enabeled.

I also had set "NvAGP" to "1" (= use NVidia-AGP) in xorg.conf, like in 
my other Myth box and as recommended in Jarod's doc.

The result was, that the NVidia driver could not use NVidia-AGP, because 
AGPGART was enabled in the kernel and so I had no AGP at all, resulting 
in 40% CPU usage from X while playing.

Now I set "NvAGP" to "3", so that the NVidia driver is able to use 
AGPGART and now X uses only 13% CPU.

I think, this could go down to 1% (as in my other Myth box), if I could 
disable AGPGART in the kernel and use NVidia-AGP.

But how to disable AGPGART in that kernel? I tried agpgart=no as boot 
parameter, but that did not help.

Thanks!

Thomas

Thomas Börkel wrote:
> HI!
> 
> Using NVidia 6629 TV-out with XV for playback in mythfrontend, I get:
> 
> - 1% CPU for mythfrontend
> - 40% CPU for X
> 
> But total CPU is at 80%, causing prebuffering pause every now and then 
> (and all the time, if I enable kernel deint in addition).
> 
> Strange is, I can't see any other process with "top", that takes the 
> rest of the CPU (the other 40%).
> 
> Watching LiveTV without prebuffering pause is impossible, because that 
> adds another 10% CPU, reaching total of over 90%.
> 
> Recording with PVR-250, 720x576, 7000/8000 bps.
> 
> Hardware: Celeron 1.3 GHz, 512 MB.
> 
> Hard disk DMA is on.
> 
> Fecora Core 2, Kernel 2.6.9, Myth 0.16.
> 
> I was once using a P-III/866 in another machine, that had no problems 
> with the same settings (resolution, bitrate), playing at 50% CPU total.
> 
> Any hints?
> 
> Thanks!
> 
> Thomas
> 
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