linux-kernel - Re: dm-ioband + bio-cgroup benchmarks

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Message-Id: <20080919.203153.183041336.ryov@valinux.co.jp>
Date:	Fri, 19 Sep 2008 20:31:53 +0900 (JST)
From:	Ryo Tsuruta <ryov@...inux.co.jp>
To:	yoshikawa.takuya@....ntt.co.jp
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, fernando@....ntt.co.jp,
	balbir@...ux.vnet.ibm.com, xemul@...nvz.org,
	kamezawa.hiroyu@...fujitsu.com, agk@...rceware.org
Subject: Re: dm-ioband + bio-cgroup benchmarks

Hi Yoshikawa-san,

> When you have time, would you explain me how you succeeded to check the
> time, bandwidth, especially when you did write() tests? Actually, I tried
> similar tests and failed to check the bandwidth correctly. Did you insert
> something in the kernel source?

I'm using our own tool, which issues I/Os in prallel in a specified
period and counts up how many I/Os are issued and how many bytes are
transferred in the period.

I'm also using our own tool for measurement of throughput variation to
see the internal data of dm-ioband. This tool is implemented as a
kernel module.

Thanks,
Ryo Tsuruta
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