Re: 2.5.67-mm4 & IRQ balancing

From: Philippe Gramoullé (philippe.gramoulle@mmania.com)
Date: Tue Apr 22 2003 - 05:06:30 EST


Hello,

On Sat, 19 Apr 2003 13:38:37 -0700
Andrew Morton <akpm@digeo.com> wrote:

  | Philippe Gramoullé <philippe.gramoulle@mmania.com> 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

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