This patch appears to alter the default behavior of a stable kernel in
that it essentially disables idle load balancing. Is that a fair
assessment ?
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1831568
Title:
[realtime app] disable idle load balancing on cpus from nohz_full=
cpuset
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Bionic:
New
Bug description:
We're running realtime application on Ubuntu 16.04 with linux-image
4.15 and found that from time to time we get jitter caused by idle
load balancing. I'm providing here a patch which solved the issue for
us.
The realtime application is bound to isolated CPUs (one thread per
CPU, nohz_full= in kernel cmdline, all IRQs moved to housekeeping
CPUs), application doesn't use any linux kernel syscalls except in
startup phase so we don't expect any interruptions of the application
from the kernel or HW.
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