Hi, While investigating a 'virsh numatune' behavior in Power 9 guests I came across this doubt and couldn't find a direct answer. numad role, as far as [1] goes, is automatic NUMA affinity only. As far as Libvirt and my understanding goes , numad is used for placement='auto' setups, which aren't even allowed for numatune operations in the first place. Problem is that I'm not sure if the mere presence of numad running in the host might be accelerating the memory migration triggered by numatune, regardless of placement settings. My first answer would be no, but several examples in the internet shows all the RAM in the guest being migrated from one NUMA node to the other almost instantly*, and aside from them being done in x86 I wonder whether numad is having any impact on that. The reason I'm asking is because I don't have a x86 setup with multiple NUMA nodes to compare results, and numad is broken sparse NUMA setups for some time now ([2] tells the story if you're interested), and Power 8/9 happens to operate with sparse NUMA setups, so no numad for me. If someone can confirm my suspicion (i.e. numad has no interference in NUMA memory migration triggered by numatune) I appreciate. Thanks, DHB * or at very least no one cared to point out that the memory is migrated according to the paging demanding of the guest, as I see happen in Power guests and working as intended according to kernel cgroup docs. [1] https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/performance_tuning_guide/sect-red_hat_enterprise_linux-performance_tuning_guide-tool_reference-numad [2] https://bugs.launchpad.net/ubuntu/+source/numad/+bug/1832915
