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32-bit versus 64-bit kernels with YouTube

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

Best regards, Ryutaroh Matsumoto

From: Ryutaroh Matsumoto <ryutaroh@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

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