RFC 8K Inline Support
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- v1 RFC Latest1 of 2 patches 0 repliesNew
1 of 2 patches is in this archive. The cover letter announces 2.
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/2 | nvme-rdma: Support 8K inline | +0 | 1 reply |
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No Reviewed-by, Acked-by or Tested-by trailers for v1 yet.
Cover letter [PATCH RFC 0/2] 8K Inline Support
Quoted 10 lines · Steve Wise
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.