ALT Linux Bugzilla – #26962

В CentOS-овском /etc/rc.d/init.d/irqbalance в start() есть

        if [ -n "$IRQ_AFFINITY_MASK" ];
        then
                export IRQBALANCE_BANNED_CPUS=$IRQ_AFFINITY_MASK
        fi

а в /etc/sysconfig/irqbalance

#
# IRQ_AFFINITY_MASK
#    64 bit bitmask which allows you to indicate which cpu's should
#    be skipped when reblancing irqs.  Cpu numbers which have their.
#    corresponding bits set to zero in this mask will not have any
#    irq's assigned to them on rebalance
#
#IRQ_AFFINITY_MASK=

Наверное, не помешает добавить.