Re: [Xen-devel] radeon in dom0/ivtv in domU: irq 16 nobody cared

[Mark Hurenkamp <mark.hurenkamp@xxxxxxxxx>]

Hi,


> Anyhow, what I would like you test is to provide 'noirqdebug' flag on
> your Linux kernel command line. That should take care of the 'nobody
> cared IRQ'. Please test and see if you your machine is more or less
> sluggish.
Ok, i just rebooted my system with this setting, Will start some  
recordings,
and see how it behaves.

> Also, please do run this:
> while (true)
> do
> sleep 10
> cat /proc/interrupts | grep 16
> done
>
> during the lifecycle of the whole machine. I am curious to see whether
> you also get an IRQ storm (or if it is just a trickle - which is OK)
> after launching the DomU guest.
I put a monitor in place, we'll see what happens. As far as i can see  
now,
the radeon driver registers the IRQ, but doesn't seem to do much with it
during normal use (counter is still 0 after about 15 minutes running X  
now).
Perhaps it is meant for opengl or some accelerated function, or my  
xserver
is just not using the drivers full potential.
Which makes it all the easier to see a storm should it occur ;-)

Regards,
Mark.


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