linux-kernel - Re: ioband: Writer starves reader even without competitors

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Message-Id: <20090916.210835.104036814.ryov@valinux.co.jp>
Date:	Wed, 16 Sep 2009 21:08:35 +0900 (JST)
From:	Ryo Tsuruta <ryov@...inux.co.jp>
To:	vgoyal@...hat.com
Cc:	nauman@...gle.com, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, jens.axboe@...cle.com, agk@...hat.com,
	akpm@...ux-foundation.org, guijianfeng@...fujitsu.com,
	jmoyer@...hat.com, balbir@...ux.vnet.ibm.com, riel@...hat.com
Subject: Re: ioband: Writer starves reader even without competitors

Hi Vivek,

Vivek Goyal <vgoyal@...hat.com> wrote:
> Hi Ryo,
> 
> I notice that with-in a single ioband device, a single writer starves the
> reader even without any competitor groups being present.
> 
> I ran following two tests with and without dm-ioband devices

Thank you again for testing dm-ioband.
I got the similar results and am investigating it now.
I'll let you know if I find something.

Thanks,
Ryo Tsuruta
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