Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added:
"0001-Disable-idle-load-balancing-on-cpus-from-nohz_full-s.patch"
https://bugs.launchpad.net/bugs/1831568/+attachment/5268714/+files/0001-Disable-idle-load-balancing-on-cpus-from-nohz_full-s.patch
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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:
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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