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

[Adam Felson]

that's weird.  glx shouldn't have loaded.

On Fri, 2005-01-07 at 10:00 +0100, Thomas Börkel wrote:
> 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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-- 
Adam Felson <a.f.6 at pobox.com>