[libvirt-users] libvirt daemon and numad daemon

Hello all, I installed libvirt-0.10.2-18.el6.x86_64 ,is there any relationship between libvirtd and numad ? I found that when I started numad daemon , the vm can start in a shorter time, but when numad daemon stoped , vm could still start ,just with a longer start time. how does this work with the two daemons? thanks.