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A Disk I/O Bandwidth Controller - Implented as a Device-Mapper Module

Ryo Tsurata, VA Linux Systems Japan K.K.

dm-ioband is an IO controller which provides disk bandwidth control to Linux. The motivation of development is to isolate disk IO between virtual machines, such as KVM and Xen. dm-ioband can control bandwidth on not only disks of virtual machines, but also various type of objects, a par partition, per user, per group, per process, per process group and per cgroup basis. The bandwidth is determined according to a proportion of the weight of each object. If there is spare bandwidth, it is allowed to use it for other IOs. The implementation is quite simple, so that the performance overhead is negligible. I did some benchmarks with several storages, such as SSD, and got good results. The audience can learn:Features and internal workings of dm-ioband. Comparison to other proposed IO controllers. Benchmark results. The audience should be familiar with the Linux block layer, filesystem, I/O scheduling and disk devices.