SSSE3 CPU flag not available

tarun singhal ertarun05 at
Wed Oct 27 19:59:35 UTC 2021

I have an Openstack cluster which was created using devstack.
And recently I was involved in project in which there is a dependency on
SSSE3 cpu flag in an Openstack VM instance, to accomplish certain tasks.

I searched many posts but couldn't find a definitive solution. The
suggestion mentioned didn't worked for me either.

I have added below in /etc/nova/nova.conf and restarted
devstack at n-cpu.service
cpu_mode = host-model
cpu_model_extra_flags = ssse3

Please let me know a possible way to enable SSSE3 cpu flag in a vm instance.

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