em interrupt storm

Kris Kennaway kris at obsecurity.org
Thu Dec 1 12:02:48 PST 2005


On Thu, Dec 01, 2005 at 11:53:00AM -0800, Doug Ambrisko wrote:
> Kris Kennaway writes:
> | On Thu, Dec 01, 2005 at 11:32:10AM -0800, Doug Ambrisko wrote:
> | > On Thursday 24 November 2005 01:27 am, Kris Kennaway wrote:
> | > > On Wed, Nov 23, 2005 at 03:02:05PM -0800, Darren Pilgrim wrote:
> | > > > Until this gets "fixed" in FreeBSD, what should those of us who are
> | > > > effectively stuck with this hardware do to avoid the problem?  Does the
> | > > > problem exist in RELENG_4?
> | > >
> | > > Yes, on the same machine I first mentioned.
> | > 
> | > Is this is SMP on or off?  I think it might be okay if SMP if off.
> | 
> | With SMP, I don't recall if I tried it without.  SMP is pretty useless
> | on 4.x (often hurts more than it helps), so this may be an acceptable
> | workaround for the OP.
> 
> Could you try without SMP?  I wonder if the BIOS sets things up okay
> in UP mode.  I saw strangeness on our PE2850's in SMP mode that didn't
> happen in UP mode.  This is with 4.X.

Without SMP, the amr and em0 devices are both assigned to irq10.
There does not appear to be an interrupt storm coming from amr
activity (60 interrupts/sec on irq10), but I don't know if this irq
configuration would have stormed anyway, and of course the shared
interrupt is sub-optimal.

Kris
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