Hi Petr, For all but ppc64, the number shown by the initial banner and the "sys" command is essentially "the-highest-cpu-number-plus-one". For ppc64 (as requested and implemented by the IBM/ppc64 maintainers), it shows the number of online cpus. There's reasons for doing it either of the two ways, but I'm on vacation now, and you can research the list archives for the various arguments for-and-against doing it either way. Check the changelog.html for when it was changed for ppc64, and then cross-reference the revision date with the list archives. I tend to agree with you, but the only thing that's useful and available from an offline cpu is the swapper task for that cpu and the runqueue for that cpu. And both of those entities are readily accessible if you really need them. Although I don't know anything about kdb status, so maybe there's something of per-cpu interest, but I don't know why it would be necessary to "set" that cpu? In any case, like I said before, I'm just temporarily online while on vacation, and will be back to work on the 9th. Thanks, Dave