The issue is found and fixed. By default, android aosp initially constrain scheduling to only core 0 with CPU Cgroup function, the others are not allowed. When porting android asop to our platform, we did not change this correspondingly according to our platform. By changing the relevant files under /dev/cpuset in our platform, the issue is fixed.
Cheers! On Thursday, August 16, 2018 at 10:52:54 PM UTC+8, Alan wrote: > > We ported android-7.1.2_r36 to our platform LS1046ARDB which has 4 > Cortex-A72 cores, plus a NVIDIA GeForce GTX750 Ti video card. The android > works fine, but when testing its performance with Antutu, we found that the > score value of multi-core is almost the same as the one for single-core. > > By adding the mpstat tool to android, it is found that almost all of tasks > are assigned to core 0, while the other cores are always idle, as below: > > 13:41:56 CPU %usr %nice %sys %iowait %irq %soft %steal > %guest %gnice %idle > > 13:41:57 all 24.81 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 75.19 > > 13:41:57 0 100.00 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 0.00 > > 13:41:57 1 0.00 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 100.00 > > 13:41:57 2 0.00 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 100.00 > > 13:41:57 3 0.00 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 100.00 > > > 13:41:57 CPU %usr %nice %sys %iowait %irq %soft %steal > %guest %gnice %idle > > 13:41:58 all 17.25 0.00 0.50 0.00 0.00 0.00 > 0.00 0.00 0.00 82.25 > > 13:41:58 0 69.00 0.00 1.00 0.00 0.00 0.00 > 0.00 0.00 0.00 30.00 > > 13:41:58 1 0.00 0.00 1.00 0.00 0.00 0.00 > 0.00 0.00 0.00 99.00 > > 13:41:58 2 0.00 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 100.00 > > 13:41:58 3 0.00 0.00 0.00 0.00 0.00 0.00 > 0.00 0.00 0.00 100.00 > > > Attached is the Makefiles used to build the android for our platform. > > > Does anyone know what we are missing? > > Thank you. > -- -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting --- You received this message because you are subscribed to the Google Groups "android-porting" group. To unsubscribe from this group and stop receiving emails from it, send an email to android-porting+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
