linux-kernel - Re: [PATCH 00/23] per device dirty throttling -v8

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Message-ID: <10215.1186809557@turing-police.cc.vt.edu>
Date:	Sat, 11 Aug 2007 01:19:17 -0400
From:	Valdis.Kletnieks@...edu
To:	Bill Davidsen <davidsen@....com>
Cc:	david@...g.hm, Diego Calleja <diegocg@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	J??rn Engel <joern@...fs.org>, Jeff Garzik <jeff@...zik.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, linux-mm@...ck.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	miklos@...redi.hu, akpm@...ux-foundation.org, neilb@...e.de,
	dgc@....com, tomoki.sekiyama.qu@...achi.com, nikita@...sterfs.com,
	trond.myklebust@....uio.no, yingchao.zhou@...il.com,
	richard@....demon.co.uk
Subject: Re: [PATCH 00/23] per device dirty throttling -v8

On Fri, 10 Aug 2007 00:04:45 EDT, Bill Davidsen said:

> > I never imagined that itwas the 20%+ hit that is being described, and 
> > with so little impact, or I would have switched to it across the board 
> > years ago.
> > 
> To get that magnitude you need slow disk with very fast CPU. It helps 
> most of systems where the disk hardware is marginal or worse for the i/o 
> load. Don't take that as typical.

I suspect that almost every single laptop with a Core2 Duo in it falls into
that classification, and it's getting worse every year, as we see more
disparity between CPU speeds (increasing) and disk seek times (basically nailed
to the floor for the last decade).


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