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xen-devel
Re: [Xen-devel] xhci passthrough
On Thu, Oct 28, 2010 at 12:01:18AM +0200, Sander Eikelenboom wrote:
> Hi Konrad,
>
> Due to a 2.6.37-merge-window kernel now being able to boot under Xen i was
> able to test my xhci controller under dom0 which i previously couldn't.
>
> The results:
> A) 2.6.37-merge-window kernel baremetal: Videograbbing while doing 20
> iterations of make -j6 of kernel works.
> B) Xen + 2.6.37-merge-window kernel as Dom0: Videograbbing while doing 20
> iterations of make -j6 of kernel works.
Great!
> C) Xen + 2.6.32.24 pvops dom0 + 2.6.37-merge-window kernel DomU:
> Videograbbing while doing 20 iterations of make -j6 still freezes the
> machine without a trace after a short while.
Ok, so it points to the 2.6.32.24 doing something funky, which unfortunatly
does not help that much
as the xen patches that are in the 2.6.37-merge-window for IRQ are about the
same
as what 2.6.32.24 has. Thought the 2.6.37-merge-window got tons of bells and
whistles in the
generic Linux kernel code part.
These interrupts were for the MSI-X for the XHCI controller or was it legacy
interrupts?
>
> An other interesting thing is the interrupt rate i see in /proc/interrrupts
> for the xhci controller, i measured for 5 minutes each time.
> In situation:
> A) About 3200 Interrupts/second
> B) About 3200 Interrupts/second
> C) About 7800 Interrupts/second, what would be 7.8 interrupt per ms which
> seems to work as long as you don't stress the rest to the limit.
> Which probably causes some sort of deadlock (some where in the path from
> device, xen, dom0/pciback , domU/pcifront, xhci driver, application.) when
> not delivered on time or when it boldly goes on a code path where no one has
> gone before ..
>
> Compared with a measurement of interrupts by a USB2 controller:
> Around 155 Interrupts/second
>
> Probably a silly question without a right answer ... but what interrupt rate
> would you guess it should be able to take ?
> And is it logically that when passed through it causes around 2.5 times more
> interrupts ?
>
> Now testing on a Intel(R) Core(TM)2 Quad CPU Q9400 @ 2.66GHz
>
> --
>
> Sander
>
>
>
>
>
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
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