I''m currently running Oracle 11g on an OpenSolaris b134 PV-domU under XenServer 5.6 on a Dell PowerEdge 6800. I tried BFUing to b142, but it was unstable so I beadm''d back to b134. Anyways, I''m noticing high kernel CPU usage: CPU states: 83.0% idle, 6.0% user, 10.9% kernel, 0.0% iowait, 0.0% swap A "lockstat -kIW -D 20 sleep 30" shows high HYPERVISOR_sched_op calls, but from what I read that''s normal as it''s used to idle VCPUs? Profiling interrupt: 23368 events in 30.111 seconds (776 events/sec) Count indv cuml rcnt nsec Hottest CPU+PIL Caller ------------------------------------------------------------------------------- 20553 88% 88% 0.00 33437 cpu[7] HYPERVISOR_sched_op 987 4% 92% 0.00 20889 cpu[6] (usermode) 383 2% 94% 0.00 20547 cpu[3] bcopy 116 0% 94% 0.00 18556 cpu[3] fletcher_4_native 90 0% 95% 0.00 15753 cpu[3] mutex_enter I noticed that the iowait is next to nothing. Is the kernel usage basically I/O, but because of the nature of the PV-domU, it''s showing up as kernel CPU and not I/O? Or is it another problem completely? Sorry if this has been brought up before. I did some searching and nothing stood out. Thanks! -Dustin