[linux-audio-user] APIC is bad?

[Florin Andrei]

On Fri, 2004-07-16 at 11:15, Mark Knecht wrote:
> Florin Andrei wrote:
> > 
> > The reality is quite the opposite. With IO-APIC the IRQs suffer from
> > more overlapping than without it. Which is kind of strange to me.
> > 
> > BTW, the mobo is based on the NForce v1 chipset.
> 
> As per Clemens' note this is complicated. I'm not sure I understand your 
> feedback about 'suffers from more overlapping'.

More devices were crowded upon the same IRQ.

> Could you post the 
> output of /proc/interrupts for the same machine configuration with 
> IO-APIC and old style interrupts?

Well, i had to make some changes anyway, so my NForce mobo has been
officially demoted to the status of Internet firewall mobo. Now my PC's
mobo is SiS based, same generation as NForce2 and probably pretty much
the same performance.
There's a distasteful overlap between EMU10K1 and eth0 but i'm not using
the network too much while doing audio work:

[florin at rivendell florin]$ cat /proc/interrupts
           CPU0
  0:   28956075    IO-APIC-edge  timer
  1:         10    IO-APIC-edge  i8042
  8:          1    IO-APIC-edge  rtc
  9:          0   IO-APIC-level  acpi
 12:         58    IO-APIC-edge  i8042
 14:      35556    IO-APIC-edge  ide0
 15:         33    IO-APIC-edge  ide1
 16:    2503314   IO-APIC-level  ohci1394, nvidia
 17:         88   IO-APIC-level  ide2, ide3
 19:       3098   IO-APIC-level  eth0, EMU10K1
 20:          0   IO-APIC-level  ohci_hcd
 21:          0   IO-APIC-level  ohci_hcd
 23:          0   IO-APIC-level  ehci_hcd
NMI:          0
LOC:   28957230
ERR:          0
MIS:          0

The kernel is the latest Fedora 2 update (2.6.6-1.435.2.3) rebuilt by
myself with pre-empt and IO-APIC enabled.

-- 
Florin Andrei

http://florin.myip.org/