How to use the command line to set NIC interrupts

1. Log in to the real-time system of the intelligent machine, refer to the document How to log in and view the system

1.1 Set network interface card interrupt

The following operation method takes the SP7020H (SP7022) model as an example

Method 1 (This method mainly explains the principle. Power failure and restart will fail. It is recommended to use Method 2)

• View network interface card name

ip a

• If you want to set an interrupt to CPU1 for enp8s0, use the command to check the interrupt number

watch -n1 cat /proc/interrupts

The green box in the picture is the network interface card corresponding to enp4s0 interrupt number

• Switch to administrator permissions

sudo su

• Set network interface card interrupt to CPU1

echo 2 > /proc/irq/163/smp_affinity
echo 2 > /proc/irq/164/smp_affinity
echo 2 > /proc/irq/165/smp_affinity
echo 2 > /proc/irq/166/smp_affinity
echo 2 > /proc/irq/167/smp_affinity
echo 2 > /proc/irq/168/smp_affinity

If you want to set the interrupt to CPU0: echo 1 > /proc/irq/interrupt number/smp_affinity

If you want to set the interrupt to CPU2: echo 4 > /proc/irq/interrupt number/smp_affinity

If you want to set the interrupt to CPU3: echo 8 > /proc/irq/interrupt number/smp_affinity

• Check if the interrupt was set successfully

watch -n1 cat /proc/interrupts

If you see that the interrupt number under cpu1 keeps changing, it means that the setting is successful. For details, please check the video.

• Switch to sinsegye user

su sinsegye