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Adjusting NIC Interrupt Affinity

Purpose

In this scenario, you can reduce the number of NIC queues and bind their interrupts to specific cores to optimize the performance.

Procedure

  • Create a shell script, copy the following code to the script, and execute the script.
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    #! /bin/bash
ethtool -K enp134s0 gro on
ethtool -K enp134s0 tso on
ethtool -K enp134s0 gso on
ifconfig enp134s0 mtu 9000 up
ethtool -G enp134s0 rx 4096 tx 4096
ethtool -G enp134s0 rx 4096 tx 4096
ethtool -L enp134s0 combined 4
  • Create a shell script, copy the following code to the script, and execute the script. $1 indicates the NIC name. After execution, NIC interrupt-to-core binding will be applied.
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    # /bin/bash
t=32
for i in `cat /proc/interrupts |grep -e $1 |awk -F ':' '{print $1}'`
do
cat /proc/irq/$i/smp_affinity_list
echo $t > /proc/irq/$i/smp_affinity_list
cat /proc/irq/$i/smp_affinity_list
t=`expr $t + 1`
done