On 06/23/2016 11:28 AM, Balbir Singh wrote: [ ... ]
cpuidle_enter_state() { [...] time_start = local_clock(); [enter idle state] time_end = local_clock(); /* * local_clock() returns the time in nanosecond, let's shift * by 10 (divide by 1024) to have microsecond based time. */ diff = (time_end - time_start) >> 10; [...] dev->last_residency = (int) diff; } Because of >>10 as opposed to /1000, last_residency is lesser by 2.3%
I am surprised the last_residency is 2.3% exactly less. The difference between >>10 and /1000 is 2.34%.
What is the next target residency value ? Does it solve the issue if you replace >>10 by /1000 ? -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
