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[Xen-users] Changing netback tx interrupts affinity on Dom0



Hi,

While I was running Apache server,
I found that one of Dom0 vcpu is running 100% to handle irqs,
and those irqs are set to be processed only on that specific vcpu.

Referring to this document,
I tried to change smp_affinity by writing a value to /proc/irq/<irq-no>/smp_affinity,
however the smp_affinity value was not changed.

I'm working on Xen 4.5 on ARMv8,
and the irq is netback tx interrupt.

#Âcat /proc/irq/106/smp_affinity
1

# cat /proc/interrupts
...
106:   Â53849     Â0     Â0     Â0  xen-dyn-event   vif1.1-q0-tx
107:     Â1     Â0     Â0     Â0  xen-dyn-event   vif1.1-q0-rx
108:   Â61460     Â0     Â0     Â0  xen-dyn-event   vif1.1-q1-tx
109:     Â1     Â0     Â0     Â0  xen-dyn-event   vif1.1-q1-rx
110:   Â67118     Â0     Â0     Â0  xen-dyn-event   vif1.1-q2-tx
111:     Â1     Â0     Â0     Â0  xen-dyn-event   vif1.1-q2-rx
112:   Â58273     Â0     Â0     Â0  xen-dyn-event   vif1.1-q3-tx
113:     Â1     Â0     Â0     Â0  xen-dyn-event   vif1.1-q3-rx
...

What would be the way to change smp_affinity?
and where is the affinity set initially for netback tx interrupts?

Thanks,
Jintack
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