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What Can I Do If the CPU Usage Is High?
When a device has a high CPU usage, perform the following operations:
- Check whether the CPU usage keeps increasing or increases instantly. If the CPU usage increases instantly, an operation may be performed, for example, the device just starts, information about optical modules is read continuously, and traffic volume increases instantly. This situation does not affect the device operation.
- Check which task process causes a high CPU usage and analyze the task.
- Check log information and alarm information to determine whether a hardware fault alarm is generated.
- Check whether an interface frequently alternates between Up and Down states according to log information and alarm information. If so, check whether the optical module of the interface is faulty or a non-Huawei-certified optical module is used. Additionally, analyze the configuration and traffic volume of the interface.
- Check whether network management operations are frequently performed on the device.
- Check whether STP flaps or routing protocols flap.
- Check whether the network structure changes and whether a loop occurs on the network.
- Check whether malicious attacks exist.
For details on how to locate a high CPU usage, see "High CPU Usage" in the Troubleshooting.
