linux-kernel - Re: Regarding dm-ioband tests

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Message-Id: <20090908.140516.104049366.ryov@valinux.co.jp>
Date:	Tue, 08 Sep 2009 14:05:16 +0900 (JST)
From:	Ryo Tsuruta <ryov@...inux.co.jp>
To:	balbir@...ux.vnet.ibm.com
Cc:	riel@...hat.com, vgoyal@...hat.com, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, jens.axboe@...cle.com, agk@...hat.com,
	akpm@...ux-foundation.org, nauman@...gle.com,
	guijianfeng@...fujitsu.com, jmoyer@...hat.com
Subject: Re: Regarding dm-ioband tests

Hi Balbir,

Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> * Ryo Tsuruta <ryov@...inux.co.jp> [2009-09-08 12:01:19]:
> 
> > I think there are some advantages to dm-ioband. That's why I post
> > dm-ioband to the mailing list.
> > 
> > - dm-ioband supports not only proportional weight policy but also rate
> >   limiting policy. Besides, new policies can be added to dm-ioband if
> >   a user wants to control bandwidth by his or her own policy.
> > - The dm-ioband driver can be replaced without stopping the system by
> >   using device-mapper's facility. It's easy to maintain.
> > - dm-ioband can use without cgroup. (I remember Vivek said it's not an
> >   advantage.)
> 
> But don't you need page_cgroup for IO tracking?

It is not necessary when controlling bandwidth on a per partition
basis or on a IO thread basis like Xen blkback kernel thread.

Here are configration examples.
http://sourceforge.net/apps/trac/ioband/wiki/dm-ioband/man/examples

Thanks,
Ryo Tsuruta
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