Subj : 1-wire behaviour on Bookworm
To   : All
From : druck
Date : Thu Sep 19 2024 10:36:16

After getting another Pi 5, I've moved a Pi 4B running Bookworm in to
the role taken by a Pi 3B running Bullseye, which is monitoring 6
ds18b20 sensors, configured as 2 1-wire buses with 3 sensors on each.

With the Pi 3B, I could either read the sensors sequentially taking
about 0.9s each, or using threads simultaneously in 1.0s. The Pi 4B with
Bookworm reads the sensors sequentially a shade faster at just over
0.8s, but when reading simultaneously, returns 2 after 0.8s, another 2
after 1.6s and the last two at 2.4s.

Anyone have an explanation for this?

It's not a problem as I changed some time ago from performing one
simultaneous read every 5 minutes to reading sequentially every minute
and averaging over 15 minutes.

---druck

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