linux-kernel - Re: [PATCH 0/2] dm-band: The I/O bandwidth controller: Overview

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Date:	Thu, 24 Jan 2008 02:25:15 +0900 (JST)
From:	Ryo Tsuruta <ryov@...inux.co.jp>
To:	a.p.zijlstra@...llo.nl
Cc:	linux-kernel@...r.kernel.org, dm-devel@...hat.com,
	containers@...ts.linux-foundation.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xensource.com
Subject: Re: [PATCH 0/2] dm-band: The I/O bandwidth controller: Overview

Hi Peter,

> What definition of bandwidth does it use? Does it for example account
> for seek latency?

The bandwidth in dm-band is determined by the proportion of the
processing time of each device's tokens(I/Os) to the processing time
of all device's tokens(I/Os).
The processing time of one token(I/O) is determined by one I/O cycle 
include seek latency, interrupt latency, etc...

Thanks,
Ryo Tsuruta <ryov@...inux.co.jp>
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