QEMU cpu socket allocation

[Rajesh A]

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
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