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SubjectRe: [patch] 2.4.0, 2.4.0-ac12: APIC lock-ups
"Maciej W. Rozycki" wrote:
>
> I'll implement an 82489DX update in a few days, but for now I'd like
> everyone interested to test the following patch as much as possible. It
> applies to 2.4.0, 2.4.0-ac12 and 2.4.1-pre11 cleanly.
>
I'm not totally convinced that this fixes all problems:

No lockup, and but a slightly increased packet loss: every few minutes a
block of 5-10 packets is lost. Cpu load is low (~30%), I'm running 3
concurrent bw_tcp, the io apic computer is the 'server'.

IIRC my original patch caused a far higher packet loss, perhaps because
it's slower? (you wrote something about 2 r/w accesses).

Are you sure that this really fixed the bug?
Remember that switching the 'trigger mode' bit will revive the io apic.

It's possible that
* the io apic still locks up.
* but now {en,dis}able_irq() switches the 'trigger mode' bit, and thus
resets the io apic after a few msec --> a few lost packets.
It's far better than before, but I assume the bug is hidden, not fixed.

I'll make additional tests.

Send the patch to Linus - it makes ne2k cards usable with 2.4+io apic.

--
Manfred
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