I confirm, this seems to be what is causing the problem on my Fedora
Core 5. If I turn off the service
/etc/init.d/cpuspeed stop
and start the mythfrontend, I get no errors at all both in the frontend
output and in the output of dmesg (at least for the few minutes that I
tried. A few seconds were easily sufficient to see the errors before)
Debian has no cpuspeed script in the /etc/init.d/ directory, but I don't
know if this feature is compiled in the kernel. Is there a way to tell
from the output of some command or from looking at the kernel
configuration file?
The following information was asked in a previous post:
The compiler that I used to compile ivtv on Debian is:
gcc (GCC) 4.1.2 20060729 (prerelease) (Debian 4.1.1-10)
On Fedora I got the same problem both with precompiled packages from
atrpms and compiling ivtv myself. In this latter case I used:
gcc (GCC) 4.1.1 20060525 (Red Hat 4.1.1-1)
Please let me know if you need me to run more test and provide more
information!!
Thank you everyone for your help!
Valerio
Simen Thoresen wrote:
> Hi Valerio,
>
> Altho I have not done any IVTV development work, I have been gathering
> a bit of data on this with the help of a few other list participants.
> If you still have both Debian and FC5 available, please compare
> powernow-support (cpu speed throttling) between them - either as
> kernel modules or built in. I've been running a longeish testseries
> here, and I'm pretty sure I never saw the DMA error before enabling
> the 'cpuspeed' service (it'll probably be called that on FC5, but I
> don't know how Debian implements this). Unfortunately, a simultanous
> CPU, kernel and ivtv -upgrade skewed my earlier impression a bit, but
> I'm pretty sure this is neither a kernel (including ivtv) -version nor
> an SMP issue.
>
> I've now been running close to a week with cpuspeed disabled and
> rather more grabbing than I normally do, and have yet to see a single
> error (with my previous schedule it seems to occur every two days or
> so with cpuspeed enabled).
>
> Yours,
> -S
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