Re: noapic doesn't quite work as advertised

(no name) ((no email))
Wed, 23 May 2001 08:34:30 +0000


> 've got a tyan s2520 motherboard (dual PIII + i840) which is having a
> problem with APIC errors. I tried running with noapic, but there were
> still errors, although fewer. Does anyone have any idea what is going
> on? I'm running 2.4.4 and software raid5, which generates a lot of
> interrupts.

noapic only prevents that hardware interrupts are rerouted through the
io apic.

The inter processor interrupts still use the apic bus, and it's
impossible to use SMP without IPIs.

> Right now I'm running with noapic and nosmp and so far this seems to
> be working. I really would like to be able to use the second
> cpu so any suggestion would be greatly appreciated.

It could be a hardware problem, or the board uses an unusal io apic
that's not properly handled.
If you boot without noapic, are there any unusual message in the boot
log?

Perhaps
MP-BIOS bug
unknown io apic
etc.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/