Re: Longstanding bug in our IRQ code (irqbalance HPMCs parisc SMP machines)

[Grant Grundler <grundler@parisc-linux.org>]

On Sat, Apr 24, 2010 at 04:44:27PM +0200, Thibaut VAR=C8NE wrote:
=2E..
> I'm not sure, it's been a very long time since I last tracked down th=
is=20
> bug. Maybe I'm remembering it wrong.
> FWIW, no MSI on this machine (L1000) and PCI card (sym53c896).

Ok - true. We don't support MSI AFAIK.
That means whatever is going wrong, is happening in the IO SAPIC.

>
>>> Now, I'm quite convinced that irqbalance could be one of the (major=
?)
>>> cause of instability of the parisc autobuilders. AFAIU, they've =20
>>> decided
>>> to disable it on their setup, maybe the situation will improve ther=
e.
>>> Still, irqbalance is only the messenger, and I'm wondering whether =
=20
>>> that
>>> apparent bug in our IRQ code could also be responsible for other =20
>>> issues
>>> we're still having.
>>
>> Sounds like it. Though the HPMCs are clearly different than the PTE =
=20
>> issues
>> that jda/carlos are seeing.
>
> True, but I remember Debian staff complaining about random unexplaine=
d =20
> hangs, I wouldn't be too surprised if this came into play...

Yes, especially given the fact the "hangs" generally means
the "machine suddenly stopped responding".

cheers,
grant
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