Re: [Xen-devel] Xen 4.2.0-rc4 issues with DVB tuner

[Javier Marcet <jmarcet@xxxxxxxxx>]

On Tue, Sep 18, 2012 at 4:33 PM, Sander Eikelenboom
<linux@xxxxxxxxxxxxxx> wrote:

>>>> What I donÂt understand is how graphics pass through even works
>>> and a tuner
>>>> card has problems due to the introduced latencies in the
>>> IRQs.
>>>
>>> Do you have
>>>> any more info about this?
>>>
>>> In this respect sound is harder than graphics. Try pinning your dom0 to a
>>> CPU core, and set affinities on other domains so that dom0 does not compete
>>> for the core with any other domains.
>
>> All right, I can try that. However, the problem happens without any
>> domU running, just
>> the dom0. Do you still think that pinning to a cpu core or setting
>> affinities can help?
>
> I haven't followed the thread closely, but are you sure the device works OK 
> on baremetal (linux without xen) ?
> If you have problems in dom0 it seems it hasn't got much to do with 
> passthrough ?

You are right, I havenÂt reached the point of trying to passthrough it
to a domU.

IÂm sure the device works fine on bare metal. I have it working on an
HTPC which makes 2-3
recordings per day, without issues.

On the linux media mailing list I was said this problem was common
with all tuner cards,
more generally with any card which generates lots of interruptions and
that I should better
forget about it.


-- 
Javier Marcet <jmarcet@xxxxxxxxx>

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