linux-kernel - Re: [patch 0/4] [RFC] Another proportional weight IO controller

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Message-Id: <20081113.180558.519459540419535699.ryov@valinux.co.jp>
Date:	Thu, 13 Nov 2008 18:05:58 +0900 (JST)
From:	Ryo Tsuruta <ryov@...inux.co.jp>
To:	vgoyal@...hat.com
Cc:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	virtualization@...ts.linux-foundation.org, jens.axboe@...cle.com,
	taka@...inux.co.jp, righi.andrea@...il.com, s-uchida@...jp.nec.com,
	fernando@....ntt.co.jp, balbir@...ux.vnet.ibm.com,
	akpm@...ux-foundation.org, menage@...gle.com, ngupta@...gle.com,
	riel@...hat.com, jmoyer@...hat.com, peterz@...radead.org
Subject: Re: [patch 0/4] [RFC] Another proportional weight IO controller 

Hi,

From: vgoyal@...hat.com
Subject: [patch 0/4] [RFC] Another proportional weight IO controller 
Date: Thu, 06 Nov 2008 10:30:22 -0500

> Hi,
> 
> If you are not already tired of so many io controller implementations, here
> is another one.
> 
> This is a very eary very crude implementation to get early feedback to see
> if this approach makes any sense or not.
> 
> This controller is a proportional weight IO controller primarily
> based on/inspired by dm-ioband. One of the things I personally found little
> odd about dm-ioband was need of a dm-ioband device for every device we want
> to control.  I thought that probably we can make this control per request
> queue and get rid of device mapper driver. This should make configuration
> aspect easy.
> 
> I have picked up quite some amount of code from dm-ioband especially for
> biocgroup implementation.
> 
> I have done very basic testing and that is running 2-3 dd commands in different
> cgroups on x86_64. Wanted to throw out the code early to get some feedback.
> 
> More details about the design and how to are in documentation patch.
> 
> Your comments are welcome.

Do you have any benchmark results?
I'm especially interested in the followings:
- Comparison of disk performance with and without the I/O controller patch.
- Put uneven I/O loads. Processes, which belong to a cgroup which is
  given a smaller weight than another cgroup, put heavier I/O load
  like the following.

     echo 1024 > /cgroup/bio/test1/bio.shares
     echo 8192 > /cgroup/bio/test2/bio.shares

     echo $$ > /cgroup/bio/test1/tasks
     dd if=/somefile1-1 of=/dev/null &
     dd if=/somefile1-2 of=/dev/null &
     ... 
     dd if=/somefile1-100 of=/dev/null
     echo $$ > /cgroup/bio/test2/tasks
     dd if=/somefile2-1 of=/dev/null &
     dd if=/somefile2-2 of=/dev/null &
     ...
     dd if=/somefile2-10 of=/dev/null &

Thanks,
Ryo Tsuruta
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