So it appears it broke somewhere between v4.0 and v4.1, as the v4.0 install displays:
16,244,802,268 instructions ( +- 23.01% ) 2.108676769 seconds time elapsed ( +- 0.86% ) [a few minutes later] Bisected it down to: 106a94a0f8c207ef4113ce7e32f34a00b3b174e7 is the first bad commit commit 106a94a0f8c207ef4113ce7e32f34a00b3b174e7 Author: Jiri Olsa <jo...@kernel.org> Date: Fri Jun 26 11:29:19 2015 +0200 perf stat: Introduce read_counters function So this look like to be a regression. Thanks, Ingo