kern.sched.quantum: Creepy, sadistic scheduler

Julian Elischer julian at
Sun Apr 8 14:19:12 UTC 2018

On 7/4/18 10:21 pm, Peter wrote:
> Julian Elischer wrote:
>> for a single CPU you really should compile a kernel with SMP turned 
>> off
>> and 4BSD scheduler.
>> ULE is just trying too hard to do stuff you don't need.
> Julian,
> if we agree on this, I am fine.
> (This implies that SCHED_4BSD will *not* be retired for an 
> indefinite time!)

There is no reason to retire it.
We implemented a scheduler interface that both schedulers stick to.

> I tested yesterday, and SCHED_4BSD doesn't show the annoying behaviour.
> SMP seems to be no problem (and I need that), but PREEMPTION is 
> definitely related to the problem (see my other message sent now).
> P.
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