I've added to the hotplug wiki the observation Bryce and I made regarding the /proc/interrupts values as we off-lined and on-lined a cpu: http://www.osdl.org/cgi-bin/hotplug_wiki.pl?Counting_Interrupts Is this a bug, or just an interesting observation? -- Mary Edie Meredith Initiative Manager Open Source Development Labs maryedie@xxxxxxxx 503-906-1942