Does the VM type D48as_v5 on Ubuntu 22.04 with kernel 6.5.0-1019-azure support the 'CPU bursting' feature?

Question

Does the VM type D48as_v5 on Ubuntu 22.04 with kernel 6.5.0-1019-azure support the 'CPU bursting' feature?

On this machine, a highly loaded system is running, for which this feature is precisely needed at peak times. The documentation states that this type supports this feature, but in practice, there is no CPU boost. Can you suggest what can be done, perhaps something needs to be enabled at the operating system level?

Answer 1

Hello @Evogene

According to the Azure documentation, the Dv5-series VMs support bursting. However, it's important to note that CPU bursting is not a guaranteed feature and is subject to availability.

In addition, CPU bursting is only available for certain VM sizes and is only applicable to the vCPU performance. It does not apply to other resources such as memory or disk I/O.

Regarding your specific case, it's possible that the CPU bursting feature is not available at the moment due to resource constraints. You can check the CPU usage of your VM using the top command to see if the CPU usage is reaching the maximum limit of the VM. If the CPU usage is not reaching the maximum limit, it's possible that the CPU bursting feature is not available at the moment.

If you are experiencing performance issues during peak times, you can consider upgrading to a larger VM size that supports higher CPU performance. Alternatively, you can consider optimizing your application to reduce CPU usage during peak times.

Regarding enabling CPU bursting at the operating system level, there is no specific configuration required at the operating system level to enable CPU bursting. The CPU bursting feature is enabled at the hypervisor level and is transparent to the guest operating system.