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

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Message-Id: <1254341139.7695.36.camel@marge.simson.net>
Date:	Wed, 30 Sep 2009 22:05:39 +0200
From:	Mike Galbraith <efault@....de>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	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, torvalds@...ux-foundation.org, mingo@...e.hu,
	riel@...hat.com
Subject: Re: IO scheduler based IO controller V10


 
>  		/*
> +		 * We may have seeky queues, don't throttle up just yet.
> +		 */
> +		if (time_before(jiffies, cfqd->last_seeker + CIC_SEEK_THR))
> +			return 0;
> +

bzzzt.  Window too large, but the though is to let them overload, but
not instantly.

	-Mike

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