On 5/9/2018 10:38 AM, 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! > > Thanks, > > Steve By the way, this patch series is untested on the current top-of-tree; I ported it from an older 4.9 kernel where I was doing the performance testing. As the series is RFC, I'm just looking for whether folks think this is a "good idea" or not. So I'll post something that is ready to merge if I get positive feedback on moving forward. Steve. -- 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
