Hi Thomas, > It really does not matter when we fold the load for the outgoing cpu. > It's almost dead anyway, so there is no harm if we fail to fold the > few microseconds which are required for going fully away.
We are seeing the load average shoot up when hot unplugging CPUs (+1 for every CPU we offline) on ppc64. This reproduces on bare metal as well as inside a KVM guest. A bisect points at this commit. As an example, a completely idle box with 128 CPUS and 112 hot unplugged: # uptime 04:35:30 up 1:23, 2 users, load average: 112.43, 122.94, 125.54 Anton
