On Tue, Mar 21, 2017 at 11:46 PM, Mark Post <mp...@suse.com> wrote: > I just looked at one of my SLES12 test systems, and we have > CONFIG_NR_CPUS=256 specified, so I'm guessing having a lot of headroom > won't cause any problems.
I agree, Ubuntu has the same 256 and IIRC RH as well. I think you only waste some memory space, but IIRC the majority of this effect (if important to anybody) can be kept under control via maxcpus & possible_cpus kernel parms [1]. OTOH even 256 can be too low if you are lucky enough to have a fully fledged z13 it is 144*2SMT right - although the cases to run all that in a single LPAR might be low enough to not care (yet) ? [1]: https://lwn.net/Articles/537570/ -- Christian Ehrhardt Software Engineer, Ubuntu Server Canonical Ltd ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
