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 Steve Wise (2): nvme-rdma: Support 8K inline nvmet-rdma: Support 8K inline drivers/nvme/host/rdma.c | 21 +++++++++++++++------ drivers/nvme/target/rdma.c | 4 ++-- 2 files changed, 17 insertions(+), 8 deletions(-) -- 1.8.3.1 -- 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
