Hello, To implement meaningful IO resource accounting and distribution, it's necessary to know how much each IO or a group of IOs costs. With rotational devices, due to the inherent low performance and concurrency, direct IO cost estimation could be replaced with provisioning time slices - whatever compositions of IOs which can be performed in the same amount time are of the same cost. However, this approach can no longer be used for modern non-rotational high-performance devices with high level of concurrency. It'd be great to talk about the problem, how to work around the problem in the near future, and what solutions can be employed in the long term. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-block" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
