CVSROOT: /cvs
Module name: src
Changes by: [email protected] 2017/02/09 03:27:03
Modified files:
sys/kern : sched_bsd.c
Log message:
Do no select a CPU to execute the current thread when being preempt()ed.
Calling sched_choosecpu() at this moment often result in moving the thread
to a different CPU. This does not help the scheduler and creates a domino
effect, resulting in kernel thread moving to other CPUs.
Tested by many without performance impact. Simon Mages measured a small
performance improvement and a smaller variance with an http proxy.
Discussed with kettenis@, ok martijn@, beck@, visa@
