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The test creates two VMs and sets up cgroup blkio.weight parameter for each of their qemu processes. The ratio of weight used in test is 100:1000. However, the result is not as expected. The actual ratio of I/O speed in the two VMs is about 1:1.
status norm_weights norm_out actual
FAIL 0.0909090909091 0.497569739009 897372
FAIL 0.909090909091 0.502430260991 906138
I believe one factor that leads to the false failure is that VM disk image file should be set up with "cache=none" option.
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