Hi, on Xen 4.4, if you have only one CPU pool, "xl list --long" doesn't work anymore, throwing error "Illegal pool specified" : murmillia:~# xl cpupool-numa-split murmillia:~# murmillia:~# xl cpupool-list Name CPUs Sched Active Domain count Pool-node0 16 credit y 39 Pool-node1 16 credit y 0 murmillia:~# murmillia:~# xl list --long | wc -l 8040 Here, it works fine. Then I remove one cpupool : murmillia:~# murmillia:~# xl cpupool-destroy Pool-node1 murmillia:~# murmillia:~# xl cpupool-list Name CPUs Sched Active Domain count Pool-node0 16 credit y 39 murmillia:~# murmillia:~# xl list --long | wc -l Illegal pool specified 0 Now, it doesn't work anymore. Thanks for your work, Olivier