Replying to myself... again.
Bug report https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227436
has been submitted. Hopefully this can get picked up in 11.2 and
maybe patched into 11.1. If not at least go into 12.
Curtis
In message <387a65b7-d221-0a10-b801-1dd573054...@orleans.occnc.com>
Results:
1. The tdq_ridx pointer
The perceived slow advance (of the tdq_ridx pointer into the circular
array) is correct behaviour. McKusick writes:
The pointer is advanced once per system tick, although it may not
advance on a tick until the currently selected queue is empty. Since
each
Hi Stefan,
I'm glad to see You're thinking along similar paths as I did. But let
me fist answer Your question straight away, and sort out the remainder
afterwards.
> I'd be interested in your results with preempt_thresh set to a value
> of e.g.190.
There is no difference. Any value above 7
I forgot to attach the commands used to create the logs - they are ugly
anyway:
[1]
dtrace -q -n '::sched_choose:return { @[((struct thread
*)arg1)->td_proc->p_pid, stringof(((struct thread
*)arg1)->td_proc->p_comm), timestamp] = count(); } tick-1s { exit(0); }'
| sort -nk 3 | awk '$1 > 27
