help with siblings

[waterbottle]

 

Hi Qemu community,

 

hope you can help me with this dilemma that is confusing me :)

 

I have this cpu:

 

         <cpus num='64'>
            <cpu id='0' socket_id='0' core_id='0' siblings='0,32'/>
            <cpu id='1' socket_id='0' core_id='1' siblings='1,33'/>
            <cpu id='2' socket_id='0' core_id='2' siblings='2,34'/>
            <cpu id='3' socket_id='0' core_id='3' siblings='3,35'/>

(...)

 

and attached you can find the output of likwid-topology -g

 

the cpu is an AMD EPYC 7502P

(32 cores and 64 threads)

 

 

so my dilemma is:

 

if I want to assign a physical core to a vm

for example the first one

 

wha't the correct pair ?

0 and 1

or

0 and 32 ?

 

 

Thank you,

Mike

likwid.txt
Description: Text document