Issue

It was noticed that IRQ processing was not getting distributed as they expected across CPUs. After investigation they found the bug report https://code.google.com/p/irqbalance/issues/detail?id=40

It was verified that debug output from irqbalance showed that indeed it was not able to recognize numa nodes like that bug report describes, and of course that the /sys/devices/system/cpu/cpuX/numa files do not exist, since this is an earlier kernel than those were added.