IRQ balance behavior different in newer RHEL kernels

Solution Verified - Updated -

Issue

  • We have an irqbalance config that works on 2.6.32-279.22.1.el6.x86_64, but is failing on 2.6.32-358.6.1.el6.x86_64
  • Here is the config from each:
[root@mybox tmp]# grep -v ^# /etc/sysconfig/irqbalance
ONESHOT=yes
IRQ_AFFINITY_MASK=FFFC
  • Both are 16-core, 2 socket machines.

Environment

  • Red Hat Enterprise Linux 6.4

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