On Fri, Jan 29, 2016 at 05:40:33PM -0500, Tejun Heo wrote: > 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. Definitely interested in this topic. It's not a new problm, NCQ hard disk has the issue too, CFQ isn't very fair for NCQ disk. Thanks, Shaohua -- 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
