Hello community.
I am porting Android 4.4 to OMAP4 platform. It was discovered that Android 4.4 has bigger power consumption that Android 4.3. After some investigation I found out that DispSync model does a lot of calculation on CPU. For example, in case of videoplayback I got next results: 1. DispSync generates ~60 CPU interruption per second. It's ~15% of all CPU interruptions. 2. I changed HWC HAL to pass empty display retire fences to SurfaceFlinger and DispSync. It led to disable DispSync model and hardware vsync. And I got reduce by ~30% time when CPU works on high frequency. All data was collected by omapconf tool on SoC OMAP4470. This means that when use DispSync model power consumption on CPU is increased and as a result we have higher power consumption on SoC and on the whole device. I can't find information why DispSync was added(except commit message in repository). Maybe i was searching not good enough. Please tell me about advantages of DispSync model. Also, is it possible to disable this model? I've tried to send empty display retire fences and change define RUNNING_WITHOUT_SYNC_FRAMEWORK, but I still got additional CPU interruptions. With best regards, Maksym. -- -- 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.
