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List virtual CPU settings: 

xm vcpu-list

Pin domU to certain CPU cores: 

xm vcpu-pin <dom_id> <vcpu> <phy_cpu>

For example, to pin domain 44 to physical cpu cores 2 and 3 run these commands: 

xm vcpu-pin 44 0 2
xm vcpu-pin 44 1 3
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