On 08/22/06 13:53, Gleb Smirnoff wrote:
On Tue, Aug 22, 2006 at 10:35:19AM -0500, Eric Anderson wrote:
E> >E> >P> yongari 2006-08-22 02:32:48 UTC
E> >E> >P>
E> >E> >P> FreeBSD src repository
E> >E> >P>
E> >E> >P> Modified files:
E> >E> >P> sys/dev/em if_em.c
E> >E> >P> Log:
E> >E> >P> It seems that em(4) misses Tx completion interrupts under certain
E> >E> >P> conditions. The cause of missing Tx completion interrupts comes
E> >from
E> >E> >P> Tx interrupt moderation mechanism(delayed interrupts) or chipset
E> >bug.
E> >E> >P> If Tx interrupt moderation mechanism is the cause of false
E> >watchdog
E> >E> >P> timeout error we should have to fix all device drivers that have
E> >Tx
E> >E> >P> interrupt moderation capability. We may need more investigation
E> >E> >P> for this issue. Anyway, the fix is the same for both cases.
E> >E> >P>
E> >E> >P> This should fix occasional watchdog timeout errors seen on a few
E> >E> >P> systems.
E> >E> >P>
E> >E> >P> Reported by: -net, Patrick M. Hausen < hausen AT punkt DOT de >
E> >E> >P> Tested by: Patrick M. Hausen < hausen AT punkt DOT de >
E> >E> >
E> >E> >This look like a workaround, not a fix the root of the problem. Several
E> >E> >people on net said that this problem disappears if debug.mpsafenet=0.
E> >E> >So I think there is a problem in FreeBSD or driver, not in chip.
E> >E>
E> >E> And it also worked perfectly for a very very long time until 6.x tree.
E> >E> I went from 5-STABLE to 6-STABLE and started seeing it a lot ( a few
E> >E> times per day) on a couple servers.
E> >
E> >In 5-STABLE the watchdog events were not logged, but the watchdog was
E> >processed.
E>
E> But my interface never seemed to disappear (I page if the interface goes
E> down), and I'd still notice a link up/down, correct?
In 5-STABLE the interface up/down events were not logged, either.
Ok. Well, I just recalled that on a separate system (my workstation
actually), I went from 6.1-R to 6-STABLE as of about 8 days ago, and it
now exhibits the problem too, which hasn't happened before.
Eric
--
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Eric Anderson Sr. Systems Administrator Centaur Technology
Anything that works is better than anything that doesn't.
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