How to distribute IRQs to all cores

[J.Hwan Kim]

On 2011? 08? 26? 03:19, Akash wrote:
> Try programming the CPU-irq affinity by writing to
>
> /proc/irq/<irq-number>/smp_affinity
>
> For example masks for irqs could be :
> irq 97 - 0x1
> 99     - 0x2
> 103   - 0x4
> 104   - 0x8
>
> That way, you are hardcoding on which cpu the particular irqs should land.
>
> HTH
> Akash
>
> On Thu, Aug 25, 2011 at 4:08 AM, J.Hwan Kim <frog1120 at gmail.com 
> <mailto:frog1120 at gmail.com>> wrote:
>
>     Hi, everyone
>
>     The interrupts of my ixgbevf driver occurs only Core 0
>     although the user space "irqbalance" serivce is working.
>
>     How can I distribute the interrupt of RX in ixgbevf to all cores?
>     Is there any kernel compile option for it ?
>
>
>     cat /proc/interrupts | grep "isv"
>       97:          8          0          0          0          0
>     0          0          0   PCI-MSI-edge      isv0-rx-0
>       99:          7          0          0          0          0
>     0          0          0   PCI-MSI-edge      isv0:lsc
>      103:       2059      0          0          0          0
>     0          0          0   PCI-MSI-edge      isv2-rx-0
>      104:         14        0          0          0          0
>     0          0          0   PCI-MSI-edge      isv2-tx-0
>      105:          1         0          0          0          0
>     0          0          0   PCI-MSI-edge      isv2:mbx
>
>     "isv" is netdevice name of my ixgbevf.
>

Thank you for reply.
I want to distribute, for example, IRQ 103 to all cores as follows :
103 : 111 2344 1334 3233 2233 1111 2233 362262  isv2-rx-0
That cannot be achieved by setting /proc/irq/irq-num/smp_affinity.





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