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windows 7 cpu topology (sockets/cores/threads) management

asked 2015-06-01 09:05:40 -0500

mmeurillon gravatar image

Hello ! I have installed Openstack form Ubuntu 14.04 + Horizon Dashboard. Everything work properly excepted the number of recognized cores in Windows 7. I found several post and over threads about this problem but nothing to explain me clearly how to configure flavor or glance images to have for example 4 CPU in my Windows 7 guests...

I know that Windows 7 does not work with more than 2 sockets but normally it can detect 4 cores. I have try to modify manually my flavor from console with: nova flavor-key Test set hw:cpu_sockets=2 nova flavor-key Test set hw:cpu_cores=2 nova flavor-key Test set hw:cpu_threds=1

Without success.

Can anybody can explain my clearly how to do that or why I cannot do that (my OpenStack run Nova / KVM an KVM can be configured to run a precise number of sockets and cores)

Thank you.

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answered 2016-01-12 16:22:22 -0500

brad-x gravatar image

I found my answer to this question here: (

By specifying max_sockets the nova driver will figure out how many cores/threads it needs to set up to get the instance up to the flavor's specified number of vcpu's. In this case the hw:cpu_cores= are not needed.

Note also - this will not affect current instances for some reason. Only newly created ones.

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Asked: 2015-06-01 09:05:40 -0500

Seen: 512 times

Last updated: Jun 01 '15