Hi all, There was a debate on running 32-bit kernel on 64-bit ARM CPU. As my purely subjective experience, playing the same YouTube video on 32-bit kernel on RPi4B 8GB has 0.5 to 1 higher load average and 15 to 30% less CPU idle time than 64-bit kernel, according to "top". vc4.ko was used with both kernels and Xfce4 desktop was used. For playing YouTube by firefox, 64-bit kernel seems more suitable than 32-bit.
Exact kernel compilation options for 32- and 64-bit kernels are https://github.com/emojifreak/debian-rpi-image-script/blob/main/build-raspi-kernel.sh Best regards, Ryutaroh Matsumoto From: Ryutaroh Matsumoto <ryuta...@ict.e.titech.ac.jp> Subject: Re: Playing YouTube on RPi4B with task-gnome-desktop Date: Sat, 27 Mar 2021 12:21:42 +0900 (JST) >> (5) With the weston session, the frame drop and texture degradation decrease >> and >> the load average decreases below 4. > > On the same hardware, task-xfce-desktop seems to give even smoother > video playing with YouTube than the weston. I wonder if a promise by > Wayland is less overhead than the conventional X server... > Memory footprints are almost the same between weston and Xfce > (1 GB of all the processes and 1GB of buffer cache). > > Best regards, Ryutaroh
