Hi Alex,
On Fri, Jun 28, 2013 at 11:49:04AM -0600, Alex Williamson wrote:
> That's interesting, I PXE boot my system from one NIC then use a
> different NIC for the iSCSI root. The PXE boot NIC now screams like
> this, _until_ I attach it to vfio, then it quiets down.
Can you please send an example line of the reported fault? The addresses
it faults on would be interesting.
> > Any idea?
>
> Not really without some digging. I wonder if it's a new event each time
> or if something is just not clearing a previous event. ISTR that a boot
> used to often, but not always, generate a couple faults between the
> IOMMU being enabled and the NIC driver being loaded. All the faults I
> see are to the same address, so my guess is that it's getting replayed.
Well, I think it is a problem uncovered by the patch that re-enables the
event-log interrupt after it happened once. We need to find a strategy
to cope with those problems.
To my mind as a quick-fix comes rate-limiting for the printks. Or we use
the suppress-pf bit in the DTE to suppress all page-faults after the
first one.
Joerg
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