Red Hat Bugzilla – Bug 1251255
Avoid unbound workqueues on isolated CPUs for realtime profiles.
Last modified: 2015-11-11 09:27:09 EST
Description of problem:
On RHEL-7.2 (and on v4.2 mainline kernel as well) it is possible to change the CPU affinity for unbound workqueue threads.
As it helps to reduce the load/jitter on isolated CPUs, it would be nice
to set the non-isolated CPUs as the cpumask for these threads on realtime
Version-Release number of selected component (if applicable):
tuned for RHEL-7.2
Steps to Reproduce:
1. Not applicable
cpumask on /sys/devices/virtual/workqueue/cpumask is all CPUs.
cpumask on /sys/devices/virtual/workqueue/cpumask set to non-isolated
Closing as dupe of bug 1259043 and continuing to track the issue in bug 1259043.
It's fixed there in the 'relatime' profile which is the base for other realtime profiles.
*** This bug has been marked as a duplicate of bug 1259043 ***