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

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Date:	Sat, 04 Aug 2007 13:34:04 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	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, david@...g.hm
Subject: Re: [PATCH 00/23] per device dirty throttling -v8

> > People just need to know about the performance differences - very few 
> > realise its more than a fraction of a percent. I'm sure Gentoo will 
> > use relatime the moment anyone knows its > 5% 8)
> 
> noatime,nodiratime gave 50% of wall-clock kernel rpm build performance 
> improvement for Dave Jones, on a beefy box. Unless i misunderstood what 
> you meant under 'fraction of a percent' your numbers are _WAY_ off.

it's also a Watt or so of power if you have the AHCI ALPM patches in the
kernel (which are pending mainline inclusion)...


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