linux-kernel - Re: [PATCH 03/20] blkio: Introduce the notion of weights

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Message-ID: <x498wemuy6v.fsf@segfault.boston.devel.redhat.com>
Date:	Wed, 04 Nov 2009 10:06:16 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	linux-kernel@...r.kernel.org, jens.axboe@...cle.com,
	nauman@...gle.com, dpshah@...gle.com, lizf@...fujitsu.com,
	ryov@...inux.co.jp, fernando@....ntt.co.jp, s-uchida@...jp.nec.com,
	taka@...inux.co.jp, guijianfeng@...fujitsu.com,
	balbir@...ux.vnet.ibm.com, righi.andrea@...il.com,
	m-ikeda@...jp.nec.com, akpm@...ux-foundation.org, riel@...hat.com,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [PATCH 03/20] blkio: Introduce the notion of weights

Vivek Goyal <vgoyal@...hat.com> writes:

> o Introduce the notion of weights. Priorities are mapped to weights internally.
>   These weights will be useful once IO groups are introduced and group's share
>   will be decided by the group weight.

I'm sorry, but I need more background to review this patch.  Where do
the min and max come from?  Why do you scale 7-0 from 200-900?  How does
this map to what was there before (exactly, approximately)?

Cheers,
Jeff
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