This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-devel] spurious interrupts


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.


Xen-devel mailing list

<Prev in Thread] Current Thread [Next in Thread>