linux-kernel - Re: IO scheduler based IO controller V10

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Message-Id: <1254508397.8667.24.camel@marge.simson.net>
Date:	Fri, 02 Oct 2009 20:33:17 +0200
From:	Mike Galbraith <efault@....de>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	Ulrich Lukas <stellplatz-nr.13a@...enparkplatz.de>,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, dm-devel@...hat.com,
	nauman@...gle.com, dpshah@...gle.com, lizf@...fujitsu.com,
	mikew@...gle.com, fchecconi@...il.com, paolo.valente@...more.it,
	ryov@...inux.co.jp, fernando@....ntt.co.jp, jmoyer@...hat.com,
	dhaval@...ux.vnet.ibm.com, balbir@...ux.vnet.ibm.com,
	righi.andrea@...il.com, m-ikeda@...jp.nec.com, agk@...hat.com,
	akpm@...ux-foundation.org, peterz@...radead.org,
	jmarchan@...hat.com, riel@...hat.com
Subject: Re: IO scheduler based IO controller V10

On Fri, 2009-10-02 at 20:26 +0200, Jens Axboe wrote:
> On Fri, Oct 02 2009, Mike Galbraith wrote:
> > On Fri, 2009-10-02 at 20:04 +0200, Jens Axboe wrote:
> > 
> > > I'm not too crazy about it either. How about just using 'desktop' since
> > > this is obviously what we are really targetting? 'latency' isn't fully
> > > descriptive either, since it may not necessarily provide the best single
> > > IO latency (noop would).
> > 
> > Grin. "Perfect is the enemy of good" :)
> >                                                   Avg
> >      16.24   175.82   154.38   228.97   147.16  144.5     noop
> >      43.23    57.39    96.13   148.25   180.09  105.0     deadline
> 
> Yep, that's where it falls down. Noop basically fails here because it
> treats all IO as equal, which obviously isn't true for most people. But
> even for pure read workloads (is the above the mixed read/write, or just
> read?), latency would be excellent with noop but the desktop experience
> would not.

Yeah, it's the dd vs konsole -e exit.

	-Mike

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