linux-kernel - Re: [patch 0/4] [RFC] Another proportional weight IO controller

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Message-ID: <4923BBA2.1070609@unimore.it>
Date:	Wed, 19 Nov 2008 08:09:22 +0100
From:	Paolo Valente <paolo.valente@...more.it>
To:	Nauman Rafique <nauman@...gle.com>
CC:	Fabio Checconi <fchecconi@...il.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Divyesh Shah <dpshah@...gle.com>,
	Ryo Tsuruta <ryov@...inux.co.jp>, linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	virtualization@...ts.linux-foundation.org, jens.axboe@...cle.com,
	taka@...inux.co.jp, righi.andrea@...il.com, s-uchida@...jp.nec.com,
	fernando@....ntt.co.jp, balbir@...ux.vnet.ibm.com,
	akpm@...ux-foundation.org, menage@...gle.com, ngupta@...gle.com,
	riel@...hat.com, jmoyer@...hat.com, peterz@...radead.org
Subject: Re: [patch 0/4] [RFC] Another proportional weight IO controller

Nauman Rafique ha scritto:
>
>
> I think "time only budget" vs "sector budget" is dependent on the
> definition of fairness: do you want to be fair in the time that is
> given to each cgroup or fair in total number of sectors transferred.
> And the appropriate definition of fairness depends on how/where the IO
> scheduler is used. ...
>
>   
Just a general note: as Fabio already said, switching back to time 
budgets in BFQ would be (conceptually) straightforward.
However, we will never get fairness in bandwidth distribution if we work 
(only) in the time domain.



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