On 04/17/18 19:01, George Mitchell wrote: > On 04/17/18 17:20, EBFE via freebsd-stable wrote: >> [...] >> For interactive tasks, there is a "special" tunable: >> % sysctl kern.sched.interact >> kern.sched.interact: 10 # default is 30 >> % sysctl -d kern.sched.interact >> kern.sched.interact: Interactivity score threshold >> >> reducing the value from 30 to 10-15 keeps your gui/system responsive, >> even under high load. >> [...] > > I suspect my case (make buildworld while running misc/dnetc) doesn't > qualify. However, I just completed a SCHED_ULE run with > preempt_thresh set to 5, and "time make buildworld" reports: > 7336.748u 677.085s 9:25:19.86 23.6% 27482+473k 42147+431581io 38010pf+0w > Much closer to SCHED_4BSD! I'll try preempt_thresh=0 next, and I > guess I'll at least try preempt_thresh=224 to see how that works > for me. -- George > I've now done SCHED_ULE runs with preempt_thresh set to 0, 1, 5, 80, and 224. The wall clock time is uniformly in the vicinity of 10 hours. The "time" output is consistent with SCHED_4BSD, but the wall clock time is really what I care about.
Now I have set kern.sched.preempt_thresh back to the default of 80 and I am experimenting with kern.sched.interact. I'm pretty sure that setting kern.sched.preempt_thresh is not the answer to my problem. -- George
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