Message-ID: <1079581101.405919ade7af9@vds.kolivas.org>
Date: Thu, 18 Mar 2004 14:38:21 +1100
From: Con Kolivas <kernel@kolivas.org>
To: Andrew Morton <akpm@osdl.org>
Cc: Kurt Garloff <garloff@suse.de>, hch@infradead.org,
       linux-kernel@vger.kernel.org
Subject: Re: dynamic sched timeslices
References: <20040315224201.GX4452@tpkurt.garloff.de> <200403170013.38140.kernel@kolivas.org> <20040316142957.GX4452@tpkurt.garloff.de> <200403170745.02538.kernel@kolivas.org> <20040318002027.GO20121@tpkurt.garloff.de> <20040317163214.16c943c5.akpm@osdl.org>
In-Reply-To: <20040317163214.16c943c5.akpm@osdl.org>
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Quoting Andrew Morton <akpm@osdl.org>:

> Kurt Garloff <garloff@suse.de> wrote:
> >
> > Hi Con,
> > 
> > On Wed, Mar 17, 2004 at 07:45:02AM +1100, Con Kolivas wrote:
> > > > That's why I think we should offer the tunables.
> > > 
> > > If your workload is so dedicated to just number crunching it isn't hard
> to add 
> > > a zero to maximum timeslice in kernel/sced.c. 
> > 
> > Of course I can compile a custom kernel for myself and tune all sorts of
> > things. But this is not the way most Linux users want to use Linux any
> > more. Actually that's a long time ago.
> > 
> 
> I don't think we should be averse to offering a couple of nice high-level
> scheduler tunables.  But I do think we should have testing results which
> clearly show that they provide some benefit, and we should agree that the
> scheduler cannot provide the same benefit automagically.
> 
> Apologies in advance if we've seen those testing results and I missed it.

Well that reply takes my message out of context. I'm not averse to tunables - if
they do something.

The only evidence Kurt has shown so far is that he can decrease throughput. The
rest is theoretical based on a scheduler that isn't the 2.6 kernel.

Con

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