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Date: Thu, 07 May 2009 09:18:58 +0900 (JST) From: Ryo Tsuruta <ryov@...inux.co.jp> To: vgoyal@...hat.com Cc: akpm@...ux-foundation.org, nauman@...gle.com, dpshah@...gle.com, lizf@...fujitsu.com, mikew@...gle.com, fchecconi@...il.com, paolo.valente@...more.it, jens.axboe@...cle.com, fernando@....ntt.co.jp, s-uchida@...jp.nec.com, taka@...inux.co.jp, guijianfeng@...fujitsu.com, jmoyer@...hat.com, dhaval@...ux.vnet.ibm.com, balbir@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org, containers@...ts.linux-foundation.org, righi.andrea@...il.com, agk@...hat.com, dm-devel@...hat.com, snitzer@...hat.com, m-ikeda@...jp.nec.com, peterz@...radead.org Subject: Re: IO scheduler based IO Controller V2 Hi Vivek, > Ryo, dm-ioband breaks the notion of classes and priority of CFQ because > of FIFO dispatch of buffered bios. Apart from that it tries to provide > fairness in terms of actual IO done and that would mean a seeky workload > will can use disk for much longer to get equivalent IO done and slow down > other applications. Implementing IO controller at IO scheduler level gives > us tigher control. Will it not meet your requirements? If you got specific > concerns with IO scheduler based contol patches, please highlight these and > we will see how these can be addressed. I'd like to avoid making complicated existing IO schedulers and other kernel codes and to give a choice to users whether or not to use it. I know that you chose an approach that using compile time options to get the same behavior as old system, but device-mapper drivers can be added, removed and replaced while system is running. Thanks, Ryo Tsuruta -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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