What do these numbers mean? What is the typical variance in this test when run multiple times? Transitions to idle are counted in /sys/devices/system/cpu/cpu*/cpuidle/*/usage so you can snapshot those counts, run the workload, snapshot again, and the difference is the number of transitions by each processor to each state during the test. Also interesting would be the output on this machine of dmesg | grep idle grep . /sys/devices/system/cpu/cpu*/cpuidle/*/* and the output from # turbostat -v {pigz invocation here} > pigz.out 2>&1 Can you tell me exactly how to run this test so that I can reproduce on my WSM-EX? thanks, -Len