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

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Date:	Fri, 02 Oct 2009 12:50:17 -0400
From:	Valdis.Kletnieks@...edu
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Mike Galbraith <efault@....de>,
	Corrado Zoccolo <czoccolo@...il.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Ingo Molnar <mingo@...e.hu>,
	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, torvalds@...ux-foundation.org, riel@...hat.com
Subject: Re: IO scheduler based IO controller V10

On Fri, 02 Oct 2009 11:40:20 EDT, Vivek Goyal said:

> In that case, Corrado's suggestion of refining it further and disabling idling
> for seeky process only on non-rotational media (SSD and hardware RAID), makes
> sense to me.

Umm... I got petabytes of hardware RAID across the hall that very definitely
*is* rotating.  Did you mean "SSD and disk systems with big honking caches
that cover up the rotation"?  Because "RAID" and "big honking caches" are
not *quite* the same thing, and I can just see that corner case coming out
to bite somebody on the ass...


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