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Subject: Re: kern.sched.quantum: Creepy, sadistic scheduler
To: freebsd-stable@freebsd.org
References: <pa17m7$82t$1@oper.dinoex.de>
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From: Julian Elischer <julian@freebsd.org>
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Date: Sun, 8 Apr 2018 22:19:01 +0800
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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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