Subject: Re: [PATCH] O13int for interactivity
From: Arjan van de Ven <arjanv@redhat.com>
Reply-To: arjanv@redhat.com
To: Con Kolivas <kernel@kolivas.org>
Cc: Nick Piggin <piggin@cyberone.com.au>,
       linux kernel mailing list <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@osdl.org>, Ingo Molnar <mingo@elte.hu>,
       Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>
In-Reply-To: <200308052045.39476.kernel@kolivas.org>
References: <200308050207.18096.kernel@kolivas.org>
	 <200308052022.01377.kernel@kolivas.org> <3F2F87DA.7040103@cyberone.com.au>
	 <200308052045.39476.kernel@kolivas.org>
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Date: 05 Aug 2003 12:54:27 +0200
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On Tue, 2003-08-05 at 12:45, Con Kolivas wrote:
> On Tue, 5 Aug 2003 20:32, Nick Piggin wrote:
> > What you are doing is restricting some range so it can adapt more quick=
ly
> > right? So you still have the problem in the cases where you are not
> > restricting this range.
>=20
> Avoiding it becoming interactive in the first place is the answer. Anythi=
ng=20
> more rapid and X dies dead as soon as you start moving a window for examp=
le,=20
> and new apps are seen as cpu hogs during startup and will take _forever_ =
to=20
> start under load. It's a tricky juggling act and I keep throwing more bal=
ls=20
> at it.

generally that's a sign that the approach might not be the best one.

Lets face it: we're trying to estimate behavior here. Result: There
ALWAYS will be mistakes in that estimator. The more complex the
estimator the fewer such cases you will have, but the more mis-estimated
such cases will be.
The only way to really deal with estimators is to *ALSO* make the price
you pay on mis-estimation acceptable. For the scheduler that most likely
means that you can't punish as hard as we do now, nor give bonuses as
much as we do now.


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