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

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Date:	Fri, 19 Sep 2008 17:49:24 +0900
From:	Takuya Yoshikawa <yoshikawa.takuya@....ntt.co.jp>
To:	Ryo Tsuruta <ryov@...inux.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 Tsuruta-san,

Ryo Tsuruta wrote:
> Hi All,
> 
> I have got excellent results of dm-ioband, that controls the disk I/O
> bandwidth even when it accepts delayed write requests.
> 
> In this time, I ran some benchmarks with a high-end storage. The
> reason was to avoid a performance bottleneck due to mechanical factors
> such as seek time.
> 
> You can see the details of the benchmarks at:
> http://people.valinux.co.jp/~ryov/dm-ioband/hps/
> 

I took a look at your beautiful results!
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?

Thanks,
Takuya Yoshikawa
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