Am Donnerstag, 4. August 2005 17:19 schrieb Ingo Molnar:
>
> * Karsten Wiese <[email protected]> wrote:
>
> > Hi,
> >
> > this should likely be addressed to VIA Taiwan,
> > but I don't know their engineer's e-mail address and their forum
> > doesn't work for me.
> > Maybe somebody here has a clue?
> > Or maybe this is even motherboard specific?
> >
> > To reproduce:
> > $ aplay -Dhw:0 -fdat /dev/zero
> >
> > On a sane system (or here in PIC Mode) you'll see
> > around 12 Interrupts/s.
> > Here I see 24.
>
> i think this is an effect of the 'POST-flush' symptom: the IO-APIC write
> of unmasking the IRQ does not reach the chipset before the ACK via the
> local-APIC does. Does it work fine if you artificially read after the
> IO-APIC write?
>
Sorry, I missed to say this happens on mainline .12 and .13-rcx.
In i386 and x86_64 mode.
So there is no IO-APIC (un)masking during the interrupt Routine.
I printk()ed the CPU-APIC's IRR immediately before the soundcard's
interrupt pin is deasserted and immediately after that:
The relevant IRR-bit is set again just then!
Karsten
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