linux-kernel - Re: [PATCH 0/2] dm-ioband: I/O bandwidth controller v1.8.0: Introduction

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Message-Id: <20081023.202851.112594221.ryov@valinux.co.jp>
Date:	Thu, 23 Oct 2008 20:28:51 +0900 (JST)
From:	Ryo Tsuruta <ryov@...inux.co.jp>
To:	haotian.zhang@...driver.com
Cc:	zumeng.chen@...driver.com, bruce.ashfield@...driver.com,
	linux-kernel@...r.kernel.org, dm-devel@...hat.com,
	containers@...ts.linux-foundation.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xensource.com, fernando@....ntt.co.jp
Subject: Re: [PATCH 0/2] dm-ioband: I/O bandwidth controller v1.8.0:
 Introduction

Hi Haotian,

> The results are almost the same. I can not see any change of Direct I/O
> performance for this bio-cgroup kernel feature with dm-ioband support!
> 
> Does the methord to caculate throughout should be the Rate of xdd.linux
> output? 
> Dose my testing approach should be correct? If not, please help me point
> out.

Could you try to run the xdd programs simultaneously?
dm-ioband controls bandwidth while I/O requests are issued
simultaneously from processes which belong to different cgroup.
If I/O requests are only issued from processes which belong to one
cgroup, the processes can use the whole bandwidth.

The following URL is an example of how bandwidth is shared to I/O
load change.
http://people.valinux.co.jp/~ryov/dm-ioband/benchmark/partition1.html

Thanks,
Ryo Tsuruta
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