Re: 2.5.67-mm4 & IRQ balancing

[Philippe Gramoullé]

Hello,

On Sat, 19 Apr 2003 13:38:37 -0700
Andrew Morton <[e-mail]> wrote:

  | Philippe Gramoullé <[e-mail]> wrote:
  | >
  | > [ SMP IRQ distribution ]
  | >
  | > Is this what you are looking for ? and are the values changes meaningful ?
  | 
  | Looks good to me.  But it didn't affect your machine at all, did it?

Well, no, i didn't really felt a clear change.
  | 
  | This stuff only counts when the machine is doing a lot of work.  The current
  | IRQ balancer works well under high interrupt frequencies, but does quite the
  | wrong thing if you're doing a lot of softirq work at low interrupt
  | frequencies (gige routing with NAPI).

This box is used as a desktop box, so quite a lots of open applications, but no
real high load/IO except few kernel compiles and BK consistency checks.

Thanks,

Philippe

Booted with "noirqbalance" & started irqbalance:

$ cat /proc/interrupts
           CPU0       CPU1       
  0:      73897  247288143    IO-APIC-edge  timer
  1:      38421         56    IO-APIC-edge  i8042
  2:          0          0          XT-PIC  cascade
  3:        177          0    IO-APIC-edge  serial
  8:     107607          0    IO-APIC-edge  rtc
 12:          3          0    IO-APIC-edge  i8042, i8042, i8042, i8042
 15:         32        118    IO-APIC-edge  ide1
 18:      12602       1159   IO-APIC-level  EMU10K1
 19:     454172      15987   IO-APIC-level  uhci-hcd
 20:     494005          0   IO-APIC-level  eth0
 22:     717483      38681   IO-APIC-level  aic7xxx
 23:          0          0   IO-APIC-level  uhci-hcd
NMI:          0          0 
LOC:  247366287  247364170 
ERR:          0
MIS:          0