Hi Haotian, > The results are almost the same. I can not see any change of Direct I/O > performance for this bio-cgroup kernel feature with dm-ioband support! > > Does the methord to caculate throughout should be the Rate of xdd.linux > output? > Dose my testing approach should be correct? If not, please help me point > out. Could you try to run the xdd programs simultaneously? dm-ioband controls bandwidth while I/O requests are issued simultaneously from processes which belong to different cgroup. If I/O requests are only issued from processes which belong to one cgroup, the processes can use the whole bandwidth. The following URL is an example of how bandwidth is shared to I/O load change. http://people.valinux.co.jp/~ryov/dm-ioband/benchmark/partition1.html Thanks, Ryo Tsuruta -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
