linux-kernel - Re: [dm-devel] [PATCH 1/8] dm-ioband: Introduction

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Message-Id: <20081114.081840.114538392.taka@valinux.co.jp>
Date:	Fri, 14 Nov 2008 08:18:40 +0900 (JST)
From:	Hirokazu Takahashi <taka@...inux.co.jp>
To:	psusi@....rr.com
Cc:	dm-devel@...hat.com, linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xensource.com, fernando@....ntt.co.jp,
	balbir@...ux.vnet.ibm.com, xemul@...nvz.org,
	kamezawa.hiroyu@...fujitsu.com, agk@...rceware.org
Subject: Re: [dm-devel] [PATCH 1/8] dm-ioband: Introduction

Hi,

> Ryo Tsuruta wrote:
> > Create two ioband devices "ioband1" and "ioband2". "ioband1" is mapped
> > to "/dev/sda1" and has a weight of 40. "ioband2" is mapped to "/dev/sda2"
> > and has a weight of 10. "ioband1" can use 80% --- 40/(40+10)*100 ---
> > of the bandwidth of the physical disk "/dev/sda" while "ioband2" can use 20%.
> 
> Just to clarify, when you say ioband1 can use 80% of the bandwidh, you 
> mean that is how much it will get if both io bands are loaded right?  If 
> there is no activity on ioband2, then ioband1 will get the full disk 
> bandwidth right?

Absolutely, you are right!

Thank you,
Hirokazu Takahashi.
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