On Wed, May 06, 2009 at 11:16:04AM +0800, Gui Jianfeng wrote: > 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 > Forgot to update these lines while switching from the notion of ioprio to weight for the groups. Will do that next time. Thanks Vivek > > + > > +- 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 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
