Re: QEMU cpu socket allocation

[Peter Zay]

Hi Rajesh,

Would the more intuitive CPU setting of (Sockets,Cores,Threads) = (1,16,1) be ok?

Thanks.

On Tue, May 17, 2022 at 10:03 AM Rajesh A <rajesh.a@tatacommunications.com> wrote:

Hi QEMU dev

 

Virt Manager is able to configure a QEMU VM with more CPU sockets than the physical host has.

For example, in the below VM, when I request 16 vCPU cores,  by default it takes as 16 Sockets with 1 core each. The host itself has only 2 Sockets.

1. How does QEMU allow this and how the VM works?
2. What is the recommended configuration of Sockets/Cores/Threads for best VM performance of a 16 core VM running on a 2 sockets host ?

 

 

regards,   Rajesh A Engineering Media Movement Media Services
Direct +91 44 66674575   |  Mobile +91 9043011101   |  IP 564575 rajesh.a@tatacommunications.com
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Peter