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RDDP: TCP Framing draft-ietf-rddp-mpa-05.txt

RDDP: TCP Framing draft-ietf-rddp-mpa-05.txt. David L. Black (rddp WG chair). RDDP (Partial) Overview. Function: Remote Direct Data Placement (RDDP) E.g., 4k filesystem block needs to land in 4k aligned pre-allocated buffer, even if it shows up as 6 packets.

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RDDP: TCP Framing draft-ietf-rddp-mpa-05.txt

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  1. RDDP: TCP Framingdraft-ietf-rddp-mpa-05.txt David L. Black(rddp WG chair)

  2. RDDP (Partial) Overview • Function: Remote Direct Data Placement (RDDP) • E.g., 4k filesystem block needs to land in 4k aligned pre-allocated buffer, even if it shows up as 6 packets. • Goal: Aligned zero-copy placement at receiver • Method: Framed payloads • Optimized receiver implementation looks at frame header to select receive buffer • MPA draft defines framing for TCP • TCPM review concern: RDDP is not supposed to change the TCP protocol (RDDP WG agrees) • All other concerns believed to be under control • E.g., allow overwrite of partially received data

  3. Placement I/F MPA Optimized MPA/TCP MPA and TCP: The Big Picture • Zero copy requires optimizing MPA with TCP • Socket interface is optimized away • Socket interface remains available to other applications • No change to other interfaces • MPA draft specifies “optimized” socket i/f (oops) Socket I/F TCP Interface to IP

  4. Placement I/F MPA MPA and TCP: Proposal • Specify MPA as strictly layered on TCP • Straightforward implementation copies in receive path • Explain zero-copy optimizations in Appendix • No normative requirements at MPA/TCP interface • Optimized MPA/TCP interface is private to MPA Optimized Socket I/F TCP MPA/TCP Interface to IP

  5. Questions?

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