Hello, Paolo. On Tue, Oct 04, 2016 at 07:43:48PM +0200, Paolo Valente wrote: > > I don't think IO bandwidth does not matter. The problem is bandwidth can't > > measure IO cost. For example, you can't say 8k IO costs 2x IO resource than 4k > > IO. > > For what goal do you need to be able to say this, once you succeeded > in guaranteeing bandwidth and low latency to each > process/client/group/node/user? For resource partitioning mostly. It's not a single user or purpose use case. The same device gets shared across unrelated workloads and we need to guarantee differing levels of quality of service to each regardless of the specifics of workload. We actually need to be able to control IO resources. 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
