Performance Tuning

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Setting IRQ Affinity

Now lets move the interrupts, remember your core mapping is important

Note that the separate irq for TX and RX

Transmit

# grep eth2 /proc/interrupts

CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7

74: 360345 0 0 0 0 0 0 0 PCI-MSI-X eth2-tx0

82: 647960 0 0 0 0 0 0 0 PCI-MSI-X eth2-rx0

90: 0 0 0 0 0 0 0 0 PCI-MSI-X eth2-lsc

# echo 40 > /proc/irq/74/smp_affinity

# echo 80 > /proc/irq/82/smp_affinity

Receive

# grep eth2 /proc/interrupts

CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7

194: 6477 0 0 0 0 0 0 0 PCI-MSI-X eth2

202: 5795405 0 0 0 0 0 0 0 PCI-MSI-X eth2(queue0)

# echo 40 > /proc/irq/194/smp_affinity

# echo 80 > /proc/irq/202/smp_affinity