[Lxc-users] blkio.weight doesn't work

[陈竞]

i got the problem, my script is wrong, it should drop the cache, or it will
read data from cache,
 the script is :
sync
echo 3 > /proc/sys/vm/drop_caches
dd if=/tmp/file1 of=/dev/null


size of file1 is 400M, and i get new test result:
A: blkio.weight=100    cost 11.12s   speed is 37.5MB/s
B: blkio.weight=1000    cost 6.4s   speed is 65.7MB/s

so the blkio.weight has some effect, bu the result is not as good as 1:10

2011/12/14 Zhu Yanhai <zhu.yanhai at gmail.com>

> And neither slice_idle nor group_idle is zero? Did you change any
> default parameters for CFQ?
>
> -zyh
>
> 在 2011年12月14日 下午4:55，陈竞 <cj.magina at gmail.com> 写道：
> > my io scheduler is CFQ.... So the result is weird
> >
> > 在 2011年12月14日 下午4:12，陈竞 <cj.magina at gmail.com>写道：
> >
> >> Hi， i'm using lxc in my project, i want to control disk io speed, so i
> use
> >> blkio.weight. I test it, but the result is confusing.
> >> I create two container A and B:
> >> A: blkio.weight = 100            B : blkio.weight=1000
> >>
> >> the running process in A and B are the same, which is bash script :
> >> dd if=/tmp/xxx of=/dev/null
> >> the size of xxx is 400Mb
> >>
> >> I suppose that A would be slower than B, since its weight is small,
> while
> >> the test turns out that B run as fast as A, they are in same speed.
> >> Can any help me figure it out ?
> >> PS: my kernel is 2.6.32, and lxc is 0.7.5
> >> --
> >> 陈竞，中科院计算技术研究所，高性能计算机中心
> >> Jing Chen HPCC.ICT.AC China
> >
> >
> >
> >
> > --
> > 陈竞，中科院计算技术研究所，高性能计算机中心
> > Jing Chen HPCC.ICT.AC China
> >
> >
> ------------------------------------------------------------------------------
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-- 
陈竞，中科院计算技术研究所，高性能计算机中心
Jing Chen HPCC.ICT.AC China
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