Re: [PATCH 0/2] dm-ioband: I/O bandwidth controller v1.7.0: Introduction

Hi, Ryo Tsuruta

I tested dm-ioband( the latest release, ver 1.7.0 ) IO controller, but
I had a strange result from it.
I have something wrong in test process?
The test process and results are in attached file.
Can you check my testing result and give me a helpful advices and comments?

As you can show in attached file, I tested 4 cases in dm-ioband with
tiobench() IO testing tool like as below
-	1) 3 cgroups with different weight in same ioband device(ioband1) :
Buffered IO
-	2) 3 cgroups with different weight in same ioband device(ioband1) : Direct IO
-	3) 3 cgroups with different weight in each ioband divice(ioband1, 2,
3) : Buffered IO
-	4) 3 cgroups with different weight in each ioband divice(ioband1, 2,
3) : Direct IO
But, IO bandwidth was not nearly controlled by dm-ioband

You can refer the testing tool, tiobench, in
http://sourceforge.net/projects/tiobench/
Originally, tiobench don't support the direct IO mode testing, so I
added the O_DIRECT option to tiobench source code and recompile it to
test the Direct IO cases

Thanks,
Dong-Jae, Kang

---------------------------------------------------------------------
2008/10/3 Ryo Tsuruta [off-list ref]:

Hi everyone,

This is the dm-ioband version 1.7.0 release.

Dm-ioband is an I/O bandwidth controller implemented as a device-mapper
driver, which gives specified bandwidth to each job running on the same
physical device.

- Can be applied to the kernel 2.6.27-rc5-mm1.
- Changes from 1.6.0 (posted on Sep 24, 2008):
 - Fix a problem that processes issuing I/Os are permanently blocked
   when I/O requests to reclaim pages are consecutively issued.

You can apply the latest bio-cgroup patch to this dm-ioband version.
The bio-cgroup provides a BIO tracking mechanism with dm-ioband.
Please see the following site for more information:
 Block I/O tracking
 http://people.valinux.co.jp/~ryov/bio-cgroup/

Thanks,
Ryo Tsuruta
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