irqbalance: unbalanced irqs or wrong irq assignment on system with shared level 3 cache
Issue
- On a ProLiant DL580 G7 system with Fibre Channel adapter (QLogic Corp. ISP2432-based 4Gb), since RHEL 6.6 there is a problem: all the adapter interrupts are assigned to the logical CPU 0.
# grep qla proc/interrupts
CPU0 CPU1 CPU2 CPU3 [.................] CPU78 CPU79
25: 100 0 0 0 [.....all zero....] 0 0 IR-IO-APIC-fasteoi qla2xxx
26: 945318 0 0 0 [.....all zero....] 0 0 IR-IO-APIC-fasteoi qla2xxx
28: 4273234 0 0 0 [.....all zero....] 0 0 IR-IO-APIC-fasteoi qla2xxx
30: 991039 0 0 0 [.....all zero....] 0 0 IR-IO-APIC-fasteoi qla2xxx
32: 3991989 0 0 0 [.....all zero....] 0 0 IR-IO-APIC-fasteoi qla2xxx
37: 100 0 0 0 [.....all zero....] 0 0 IR-IO-APIC-fasteoi qla2xxx
40: 3924089 0 0 0 [.....all zero....] 0 0 IR-IO-APIC-fasteoi qla2xxx
42: 3974677 0 0 0 [.....all zero....] 0 0 IR-IO-APIC-fasteoi qla2xxx
- After update to RHEL 6.6, irqbalance doesn't distribute interrupts which are bound to cache level balance, on systems with shared level 3 cache.
Environment
- Red Hat Enterprise Linux 6.6
- irqbalance 1.0.4-10.el6
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