Re: [Xen-devel] Kernel 3.7.[12] - irq 16: nobody cared

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 16.01.13 at 10:54, Steven Haigh <netwiz@xxxxxxxxx> wrote:
> So far, I have:
> # uptime
>   20:50:40 up 1 day,  1:11,  1 user,  load average: 0.36, 0.17, 0.13
> 
> As I mentioned, I moved the sata card to the second 16x PCIe slot in the 
> mainboard - which changed the IRQ from 16 to 19. Currently I see:
> # grep sata_mv /proc/interrupts
>   19:   21243495  xen-pirq-ioapic-level  sata_mv
> 
> Which is interestingly more than the onboard SATA ports:
> # grep ahci /proc/interrupts
>   50:    9004117  xen-pirq-msi       ahci

Whether the former count is too high depends on the I/O amount
going through each controller. Of course it is possible for there to
be spikes that usually don't reach the 99,900 cutoff point, but
once in a while do. Figuring whether that's the case would require
adding a little bit more verbosity to
kernel/irq/spurious.c:note_interrupt(), e.g. to warn when having
reached half the threshold.

Jan


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