AVX is not listed as a CPU feature on Linux VMs

Products

• VMware vSphere ESXi

Issue/Introduction

Running cat /proc/cpuinfo on a Linux VM does not come back with AVX being present.

Environment

VMware vSphere ESXi

Cause

Per-VM EVC or EVC level on the cluster is set to Westmere or older.

Resolution

Adjust the cluster EVC level (if hardware permits) to a higher version of EVC. AVX was introduced in Sandy Bridge going forward.

1. Select the cluster from the inventory listing
2. Configure > VMware EVC > Select Edit
3. Adjust the level of EVC

Note: All VMs will need to be powered off to allow the EVC levels to be enabled or adjusted.

Adjust the Per-VM EVC level

1. Select the VM from Inventory
2. Configure > VMware EVC
3. Select Edit. If the edit option is grayed out,  ensure the VM is powered off.
4. Adjust the EVC level to match the underlying physical CPU.

Additional Information

EVC and CPU Compatibility