** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1925026
Title:
Timer of 100us causes 64-bit app spin on Pi4
Status in linux package in Ubuntu:
Confirmed
Bug description:
This problem happens with 64-bit 20.04 LTS or 20.10 on a Raspberry Pi
4 w/4GB (I am using the official Ubuntu Pi versions). It does NOT
happen with either version when running on a standard x86 machine or
VM. Also, it does NOT happen when using the 64-bit Raspberry Pi OS
(https://downloads.raspberrypi.org/raspios_arm64/images/). So this
issue is specific to the official 64-bit Ubuntu on Raspberry Pi
version.
When a 100us timer is started (via setitimer) the app will spin at
100%. With values slightly higher (150, 200, 1000) this does not
happen. I've included the source for a small timer test program that I
found reproduces the issue that broke my larger formal app.
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