linux-kernel - Re: [patch 1/4] io controller: documentation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4917A116.7040603@cn.fujitsu.com>
Date:	Mon, 10 Nov 2008 10:48:54 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	vgoyal@...hat.com
CC:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	virtualization@...ts.linux-foundation.org, jens.axboe@...cle.com,
	Hirokazu Takahashi <taka@...inux.co.jp>,
	Ryo Tsuruta <ryov@...inux.co.jp>,
	Andrea Righi <righi.andrea@...il.com>,
	Satoshi UCHIDA <s-uchida@...jp.nec.com>,
	fernando@....ntt.co.jp, balbir@...ux.vnet.ibm.com,
	Andrew Morton <akpm@...ux-foundation.org>, menage@...gle.com,
	ngupta@...gle.com, Rik van Riel <riel@...hat.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [patch 1/4] io controller: documentation

Hi, Vivek

Thanks for your work. :)

A question below.

> +For example, assume there are two cgroups A and B with weights 1024 and 2048
> +in the system. Tasks in two cgroups A and B are doing IO to two disks sda and
> +sdb in the system. A user has enabled IO control on both sda and sdb. Now on
> +both sda and sdb, tasks in cgroup B will get to use 2/3 of disk BW and
> +tasks in cgroup A will get to use 1/3 of disk bandwidth, only in case of
> +contention. If tasks in any of the groups stop doing IO to a particular disk,
> +task in other group will get to use full disk BW for that duration.
> +

So in this example, I can't assign 1/3 of sda's disk BW while 2/3 of sdb's
disk BW to A. Am I right?
--
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/