What Do I Do If the Network Performance Is Poor When 128 Ethernet Network Devices Are Bound to a BMS?

Symptom

The network performance is poor when multiple Ethernet network devices (for example, 128 single-queue NICs) are bound to an EulerOS 2.3/Euler OS 2.5 BMS. This is because the interrupts of all the 128 NIC queues are processed by the same CPU, causing a critical bottleneck of the CPU and affecting the network performance. The root cause is that --hintpolicy=subset is set for irqbalance of the Euler OS 2.3/Euler OS 2.5 BMS. To solve the problem, change it to --hintpolicy=ignore as instructed in Procedure.

hintpolicy is a policy used by irqbalance to balance interrupts across CPUs based on affinity_hint of each interrupt. affinity_hint indicates the CPU affinity of an interrupt. The value of hintpolicy can be:

• exact: irqbalance never violates affinity_hint.
• subset: irqbalance distributes interrupts to a subset of affinity_hint.
• ignore: irqbalance completely ignores affinity_hint.

Procedure

The following operations use EulerOS 2.3 as an example:

1. Log in to the BMS as user root.
2. Run the following command to open the /etc/sysconfig/irqbalance file:

   vi /etc/sysconfig/irqbalance

3. The original setting is --hintpolicy=subset.

   

   Change the setting to --hintpolicy-ignore.