[mythtv-users] High load, low CPU usage

pixel at hourglassone.com acs at hourglassone.com
Fri Jul 11 11:24:14 EDT 2003


Sounds like XV extensions aren't enabled, but that's just my 2 cents.. Ran
into the same problem here.  It ended up being ATI's bogus support for XV.
I switched out to a Nvidia card, installed the nvidia native drivers, and
the problem simply went away.

Cheers,
Aaron

On Fri, 11 Jul 2003, Steve Hill wrote:

>
> I am recording MPEG4 at 416x576, 2200Kbps and audio quality 7, 32000KHz.
> The hardware is an Athlon XP 2100+ with a WinTV/PCI bt848 tv card.
> The frontend and backend run on the same machine.
>
> While recording, the backend's CPU usage varies between about 15% and
> 40% with the load average usually below 0.50.
>
> When playing the frontend uses under 5% CPU and the load average is under
> 0.02.
>
> The problems start when I am playing at the same time (e.g. LiveTV) - The
> load average varies anywhere from 0.50 to over 3.00.  This results in
> choppy video, and loss of AV sync.  The front end also sometimes reports
> audio buffer overflows.
>
> DMA mode is turned on on the hard drive, although it isn't hitting the
> disk much anyway.
>
> Does anyone have any ideas what might be causing the problem?  I can't
> understand why it works fine recording and playing separately but
> recording and playing symultaneously causes such a lot of load, especially
> since there is plenty of free CPU time.
>
>



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