linux-kernel - Re: Ten percent test

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Message-ID: <461A9A03.9070602@gmail.com>
Date:	Mon, 09 Apr 2007 21:54:43 +0200
From:	Rene Herman <rene.herman@...il.com>
To:	Andreas Mohr <andi@...x01.fht-esslingen.de>
CC:	Mike Galbraith <efault@....de>, Ingo Molnar <mingo@...e.hu>,
	Gene Heskett <gene.heskett@...il.com>,
	linux-kernel@...r.kernel.org, Con Kolivas <kernel@...ivas.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	ck list <ck@....kolivas.org>
Subject: Re: Ten percent test

On 04/09/2007 03:27 PM, Andreas Mohr wrote:

> And I really don't see much difference whatsoever to the I/O scheduler
> area: some people want predictable latency, while others want maximum
> throughput or fastest operation for seek-less flash devices (noop).
> Hardware varies similarly greatly has well:
> Some people have huge disk arrays or NAS, others have a single flash disk.
> Some people have a decaying UP machine, others have huge SMP farms.

I do agree, and yes, I/O scheduling seems to not have suffered from the 
choice although I must say I'm not sure how much use each I/O scheduler 
individualy sees.

If one CPU scheduler can be good enough then it would better to just 
have that one, but well, yes, maybe it can't. I certainly believe any 
one scheduler can't avoid breaking down onder some condition. Demand is 
just too varied.

I find it interesting that you see SD as a server scheduler and I guess 
deterministic behaviour does point in that direction somewhat. I would 
be enabling it on the desktop though, which probably is _some_ argument 
on having multiple schedulers.

Rene.

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