On Wed, May 09, 2018 at 08:38:05AM -0700, Steve Wise wrote: > For small nvmf write IO over the rdma transport, it is advantagous to > make use of inline mode to avoid the latency of the target issuing an > rdma read to fetch the data. Currently inline is used for <= 4K writes. > 8K, though, requires the rdma read. For iWARP transports additional > latency is incurred because the target mr of the read must be registered > with remote write access. By allowing 2 pages worth of inline payload, > I see a reduction in 8K nvmf write latency of anywhere from 2-7 usecs > depending on the RDMA transport.. > > Is this a worthwhile change? I think it is. Please comment! I think this came up before. I'm fine with supporting larger sizes, but I really want the size configurable. We can argue about the default separately. -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
