http://ubuntuforums.org – Hi, I've just upgraded my backebd server to kernel to:- Linux alpha2 3.0.0-15-generic #26-Ubuntu SMP Fri Jan 20 17:23:00 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux And I'm now seeing high CPU usage in my munin graphs. Looking at the reason I've found this:- Code: ps aux | sort -k 4 | grep migration root 6 0.0 0.0 0 0 ? S Jan27 0:00 [migration/0] root 7 0.0 0.0 0 0 ? & (Hardware)