RE: [Xen-devel] spurious interrupts

["Deuskar, Prafulla" <prafulla.deuskar@xxxxxxxxx>]

>
>On Wed, 2006-04-12 at 13:48 -0400, Stephen C. Tweedie wrote:
>
>> > While I haven't heard anything whether others were able to
reproduce
>> > this, I was now able to nail this down to a simple operation: On
the
>> > system I'm testing with I was able to identify that the handling of
>> > the interrupt from the SCSI controller triggers a simultaneous
>> > interrupt from one of the USB controllers
>
>Turns out that I'm seeing the same.  On the box that was showing
>
>>         irq 16: nobody cared
>>          Disabling IRQ #16
>
>it seems that the irq16 is indeed getting dispatched every time an
>interrupt arrives for the disk.  In this case it's sata, ICH5 on irq17.
>
>> (At least, at the time of writing that box is showing only
>> at 15,000 interrupts on irq16 after an hour instead of 100,000 after
10
>> minutes
>
>this turned out to be related to disk activity, and a heavy disk load
>rapidly reproduced the problem even with the latest Xen kernel.
>

We see similar behavior with network traffic - irq16 (attached to USB)
getting dispatched every time NIC interrupt is triggered.

Thanks,
Prafulla

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