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Message-ID: <4A0100F4.4040400@cn.fujitsu.com>
Date: Wed, 06 May 2009 11:16:04 +0800
From: Gui Jianfeng <guijianfeng@...fujitsu.com>
To: Vivek Goyal <vgoyal@...hat.com>
CC: nauman@...gle.com, dpshah@...gle.com, lizf@...fujitsu.com,
mikew@...gle.com, fchecconi@...il.com, paolo.valente@...more.it,
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Subject: Re: [PATCH 01/18] io-controller: Documentation
Vivek Goyal wrote:
...
> + mount -t cgroup -o io,blkio none /cgroup
> +
> +- Create two cgroups
> + mkdir -p /cgroup/test1/ /cgroup/test2
> +
> +- Set weights of group test1 and test2
> + echo 1000 > /cgroup/test1/io.ioprio
> + echo 500 > /cgroup/test2/io.ioprio
Here seems should be /cgroup/test2/io.weight
> +
> +- Create two same size files (say 512MB each) on same disk (file1, file2) and
> + launch two dd threads in different cgroup to read those files. Make sure
> + right io scheduler is being used for the block device where files are
> + present (the one you compiled in hierarchical mode).
> +
> + echo 1 > /proc/sys/vm/drop_caches
> +
> + dd if=/mnt/lv0/zerofile1 of=/dev/null &
> + echo $! > /cgroup/test1/tasks
> + cat /cgroup/test1/tasks
> +
> + dd if=/mnt/lv0/zerofile2 of=/dev/null &
> + echo $! > /cgroup/test2/tasks
> + cat /cgroup/test2/tasks
> +
> +- At macro level, first dd should finish first. To get more precise data, keep
> + on looking at (with the help of script), at io.disk_time and io.disk_sectors
> + files of both test1 and test2 groups. This will tell how much disk time
> + (in milli seconds), each group got and how many secotors each group
> + dispatched to the disk. We provide fairness in terms of disk time, so
> + ideally io.disk_time of cgroups should be in proportion to the weight.
> + (It is hard to achieve though :-)).
--
Regards
Gui Jianfeng
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