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Date:      Thu, 19 Apr 2018 04:15:43 +0700
From:      Eugene Grosbein <eugen@grosbein.net>
To:        Peter <pmc@citylink.dinoex.sub.org>, freebsd-stable@FreeBSD.ORG
Subject:   Re: kern.sched.quantum: Creepy, sadistic scheduler
Message-ID:  <5AD7B57F.7000005@grosbein.net>
In-Reply-To: <pb812b$1eji$2@oper.dinoex.de>
References:  <pa17m7$82t$1@oper.dinoex.de> <9FDC510B-49D0-4722-B695-6CD38CA20D4A@gmail.com> <8cfdb8a3-86a0-17ba-1e41-ff1912a30ee9@m5p.com> <20180417065617.GA95646@klump.hjerdalen.lokalnett> <CAN6yY1s7MafF18fPxgRiJVusxcbwEfK%2BGF8dKGedhXE_EUVbJA@mail.gmail.com> <CAOjFWZ47YhPFCxxhhxozUTRXY5ywPEpKrtJNaULTv37r5CFj5w@mail.gmail.com> <20180417232016.2008438c.ebfe@inbox.ru> <2a68cfd7-6823-296d-0392-c9b12c66f6e0@m5p.com> <pb812b$1eji$2@oper.dinoex.de>

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19.04.2018 0:59, Peter wrote:

>   thank You very much for Your commenting and reports!
> 
> From what I see, we have (at least) two rather different demands here:
> while George looks at the over-all speed of compute throughput, others are concerned about interactive response.
> 
> My own issue is again a little bit different: I am running this small single-CPU machine as my home-office router, and it also runs a backup service, which involves compressing big files and handling an outgrown database (but that does not need to happen fast, as it's just backup stuff).
> So, my demand is to maintain a good balance between realtime network activity being immediately served, and low-priority batch compute jobs, while still staying responsive to shell-commands - but the over-all compute throughput is not important here.
> 
> But then, I find it very difficult to devise some metrics, by which such a demand could be properly measured, to get compareable figures.

I run similar system (AMD Geode 500Mhz i386-compatible) and found that
SCHED_4BSD does it just fine without any additional non-default configuration:
no other kernel options (*PREEMPT*), no loader.conf/sysctl.conf tuning.





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