On Thu, Jan 21, 2016 at 05:41:57PM -0500, Tejun Heo wrote: [..] > A simple approximation of IO cost such as fixed cost > per IO + cost proportional to IO size would do a far better job than > just depending on bandwidth or iops and that requires approximating > two variables over time. I'm not sure how easy / feasible that > actually would be tho.
Hi Tejun, "A fixed cost per IO sounds" like iops and "cost proportional to IO size" sounds like bandwidth. I am wondering can we dynamically control both bps and iops rate of cgroup based on cgroup weight and average bw/iops of device queue. That way a cgroup can not get unfair share of disk neither by throwing lots of small IOs, nor by sending down a small number of large IOs. Will that be good enough. Thanks Vivek
