Revert "onlining all cores is a nice workaround for the r…"

This reverts commit 452a10a254318143ba5e8300d4dcb30353e00252.
Revert "Revert "onlining all cores is a nice workaround for the r…""

This reverts commit 2e14ea00bd2a2d6de91e3d975cd0db40d68135c9.