On Wed, Aug 30, 2017 at 03:41:20PM +0100, Dietmar Eggemann wrote: > The following 'capacity-dmips-mhz' dt property values are used: > > Cortex-A15: 1024, Cortex-A7: 539 > > They have been derived form the cpu_efficiency values: > > Cortex-A15: 3891, Cortex-A7: 2048 > > by scaling them so that the Cortex-A15s (big cores) use 1024. > > The cpu_efficiency values were originally derived from the "Big.LITTLE > Processing with ARM Cortex™-A15 & Cortex-A7" white paper > (http://www.cl.cam.ac.uk/~rdm34/big.LITTLE.pdf). Table 1 lists 1.9x > (3891/2048) as the Cortex-A15 vs Cortex-A7 performance ratio for the > Dhrystone benchmark. > > The following platform is affected once cpu-invariant accounting > support is re-connected to the task scheduler: Thanks, applied for v4.15. My understanding from the following comment in the cover letter is that not currently the case and this there is no behavioural change in applying this patch. For the record I observed the following with and without this patch applied. I believe this is the expected result. v4.14-rc1 # cat /sys/devices/system/cpu/cpu*/cpu_capacity 1535 1535 1535 1535 1024 1024 1024 1024 v4.14-rc1 + patch # cat /sys/devices/system/cpu/cpu*/cpu_capacity 1024 1024 1024 1024 539 539 539 539
