Re: how to balance interrupts between 2 CPUs?

[lm0re]

I think your got something  wrong, I've a 2 cpus box, all is ok,see below:

[root@info /proc]# cat interrupts
           CPU0       CPU1
  0:    1245694    1389471    IO-APIC-edge  timer
  1:        157        121    IO-APIC-edge  keyboard
  2:          0          0          XT-PIC  cascade
  8:          0          1    IO-APIC-edge  rtc
 10:      10685      10958   IO-APIC-level  usb-uhci, e100
 14:      36926      50216    IO-APIC-edge  ide0
 15:          1          1    IO-APIC-edge  ide1
NMI:          0          0
LOC:    2635076    2635074
ERR:          0
MIS:          0

Read the IRQ-affinity.txt which should usual be at
/usr/src/linux/Documentation, and change the configuration maybe your can
specify cpu1 processes the IRQ 18. And check the result.

lm0re

----- Original Message -----
From: [e-mail] <[e-mail]>
To: <[e-mail]>
Sent: Wednesday, April 10, 2002 8:23 PM
Subject: how to balance interrupts between 2 CPUs?

> Hello
>
>     I am using two Intel Giga NICs in a DELL PowerEdge 4600
>     with 2 Intel XEON 1.8GHz CPUs.
>     The matherboard is ServerWorks GC-HE.
>     The OS is RedHat 7.2, and the release of kernel is "2.4.7-10smp".
>
>     The CPU0 has very heavy interrupt traffic,
>     you can see the following information:
> >>>>>
> [root@giga root]# cat /proc/interrupts
>            CPU0       CPU1
>   0:     395117          0    IO-APIC-edge  timer
>   1:        653          0    IO-APIC-edge  keyboard
>   2:          0          0          XT-PIC  cascade
>   8:          1          0    IO-APIC-edge  rtc
>  12:         23          0    IO-APIC-edge  PS/2 Mouse
>  14:          2          0    IO-APIC-edge  ide0
>  18:         30          0   IO-APIC-level  aic7xxx
>  19:      86013          0   IO-APIC-level  eth0
>  20:      10394          0   IO-APIC-level  aic7xxx
>  21:         30          0   IO-APIC-level  aic7xxx
>  27:    5480873          0   IO-APIC-level  e1000
>  39:  164889152          0   IO-APIC-level  e1000
> NMI:          0          0
> LOC:     395013     395012
> ERR:          0
> MIS:          0
> >>>>>
>
>     The kernel's SMP option is enable, but the CPU1 is always idle.
>     How to balance the interrpupts between two CPUs?
>     If you are convenient, please give me some advice quickly.
>
>     Thank you!
>
> Best regard
>
>
> -
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