Hi, I'm running into a cgroup problem under LXC (Ubuntu 12.10 server). I've confirmed that blkio.weight is set correctly in the cgroup fs, I've also checked that Ubuntu us using the CFQ scheduler by default (/sys/block/sda/queue/scheduler = "noop [deadline] cfq"). So here's the test I ran:
I've got 2 LXC containers with these cgroup settings: lxc.cgroup.blkio.weight = 200 lxc.cgroup.cpu.shares = 200 and another container with: lxc.cgroup.blkio.weight = 800 lxc.cgroup.cpu.shares = 800 I have verified in /sys/fs/cgroup/blkio/lxc/<container-name>/blkio.weight is indeed set to 200 on the host OS. I have verified that cpu.shares are indeed split up, 80% to container 1 and 20% to container 2. But when I run this command in both containers: # write a 10GB file to disk dd bs=1M count=10000 if=/dev/zero of=1test conv=fdatasync I ran a similar test on reads.: davidparks21@test-cgroups1:/tmp$ time sh -c "dd if=1test of=/dev/null bs=1M" 10000+0 records in 10000+0 records out 10485760000 bytes (10 GB) copied, 37.9176 s, 277 MB/s real 0m37.939s user 0m0.004s sys 0m24.306s The IO speeds see in iotop on the host OS are virtually the same between the two containers. I expected to see container 2 command 80% of the IO access in this case. ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. This 200-page book is written by three acclaimed leaders in the field. The early access version is available now. Download your free book today! http://p.sf.net/sfu/neotech_d2d_may _______________________________________________ Libcg-devel mailing list Libcg-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libcg-devel
