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guoyanyan 098287f7ba bms_umn_0724 
Reviewed-by: Pristromskaia, Margarita <margarita.pristromskaia@t-systems.com>
Co-authored-by: guoyanyan <guoyanyan3@huawei.com>
Co-committed-by: guoyanyan <guoyanyan3@huawei.com>
2023-08-07 16:31:16 +00:00

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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.

Parent topic: Network and Security FAQ
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