IO does not share in multiple CPU

Question

In my linux server IO doesnot share in multiple CPU. as below output ata_piix intrupts share in only cpu0

[root@manage ~]# uname -a

Linux manage 3.14.24-1smp #12 SMP Tue Mar 17 15:33:27 IST 2015 i686 i686 i386 GNU/Linux

[root@manage ~]# cat /proc/interrupts 
            CPU0       CPU1       CPU2       CPU3       CPU4       CPU5       CPU6       CPU7       
   0:         72          0          0          0          0          0          0          0    XT-PIC-XT-PIC    timer
   1:          2          0          0          0          0          0          0          0    XT-PIC-XT-PIC    i8042
   2:          0          0          0          0          0          0          0          0    XT-PIC-XT-PIC    cascade
   4:          9          0          0          0          0          0          0          0    XT-PIC-XT-PIC    serial
  **11:    3314260          0          0          0          0          0          0          0    XT-PIC-XT-PIC    ata_piix**
  12:          3          0          0          0          0

changed some configuration now I can change the CPU, but still multiple CPUs are not shared.

  **11:    3314260          0          0          0          0          0          0          0       IO-APIC-fasteoi ata_piix**

score 1 · Answer 1 · answered Apr 01 '15 at 07:29

1

You should run the irqbalance daemon to help distribute interrupts across CPU cores.

answered Apr 01 '15 at 07:29

ewwhite

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[root@manage ~]# echo 03 > /proc/irq/11/smp_affinity -bash: echo: write error: Input/output error – user95711 Apr 01 '15 at 08:16
I guess this is something with XT-PIC-XT-PIC type – user95711 Apr 01 '15 at 08:18

IO does not share in multiple CPU

1 Answers1