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SubjectRe: SMP P4 APIC/interrupt balancing
On Wed, 17 Apr 2002, Ingo Molnar wrote:

>
> On Wed, 17 Apr 2002, James Bourne wrote:
>
> > After Ingo forwarded me his original patch (I found his patch via a web
> > based medium, which had converted all of the left shifts to compares,
> > and now I'm very glad it didn't boot...) and the system is booted and is
> > balancing most of the interrupts at least. Here's the current output of
> > /proc/interrupts
> >
> > brynhild:bash$ cat /proc/interrupts
> > CPU0 CPU1
> > 0: 171414 0 IO-APIC-edge timer
> > 1: 3 2 IO-APIC-edge keyboard
> > 2: 0 0 XT-PIC cascade
> > 8: 1 0 IO-APIC-edge rtc
> > 18: 8 7 IO-APIC-level aic7xxx
> > 19: 13566 12799 IO-APIC-level eth0
> > 20: 9 7 IO-APIC-level aic7xxx
> > 21: 9 7 IO-APIC-level aic7xxx
> > 27: 1572 5371 IO-APIC-level megaraid
> > NMI: 0 0
> > LOC: 171315 171251
> > ERR: 0
> > MIS: 0
>
> it's looking good.
>
> > So, the timer isn't being balanced still, others are (is there a
> > specific case in your patch for irq 0 (< 1)? I couldn't see it but it
> > almost looks as though it's being missed..)
>
> it's a separate bug, solved by a separate patch.
>

Hi again,

Hmm, is that something ServerWorks specific because on my Plumas chipset
the timer interrupt is balanced just fine :

(sp@puma2:~)> cat /proc/interrupts
CPU0 CPU1
0: 14358402 14297319 IO-APIC-edge timer
1: 2 1 IO-APIC-edge keyboard
2: 0 0 XT-PIC cascade
4: 336 325 IO-APIC-edge serial
8: 1 0 IO-APIC-edge rtc
9: 0 0 IO-APIC-edge acpi
15: 3 1 IO-APIC-edge ide1
16: 0 0 IO-APIC-level usb-uhci
17: 576744 574959 IO-APIC-level eth0
18: 0 0 IO-APIC-level usb-uhci
19: 0 0 IO-APIC-level usb-uhci
28: 72602 71619 IO-APIC-level aic7xxx
29: 8 8 IO-APIC-level aic7xxx
31: 0 0 IO-APIC-level e1000
48: 289545 269389 IO-APIC-level ssci
NMI: 0 0
LOC: 28654183 28654202
PMC: 0 0
ERR: 0
MIS: 0

Regards,
--
Steffen Persvold | Scalable Linux Systems | Try out the world's best
mailto:sp@scali.com | http://www.scali.com | performing MPI implementation:
Tel: (+47) 2262 8950 | Olaf Helsets vei 6 | - ScaMPI 1.13.8 -
Fax: (+47) 2262 8951 | N0621 Oslo, NORWAY | >320MBytes/s and <4uS latency

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