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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: iSCSI/iWARP drafts and flow controlOn Wednesday, July 30, 2003, at 07:49 PM, Mallikarjun C. wrote: > >> There is an identical flow control issue for >> RDMA Reads. > > Not true. There's a built-in credit renewal in an RDMA Read. > The Peer issuing the RDMA Read knows it can reuse the > Read credit when it receives an RDMA Read Response. > Send Messages carrying the "fringe" iSCSI PDUs need both > new wire protocol and cross-layer chit-chat within an end-node > between iSCSI and iSER - in order to renew credits. No new wire protocol is required. Restoration of no-CmdSNs credits could be piggy-backed on top of the existing CmdSN credit system. Basically each Cmd reply restores one "Cmd Credit". It could also restore an implicit number of "NoCmd" credits. Basically if Cmd X had been proceeded by Y "NoCmd" messages, then the reply to Cmd X would restore Y "NoCmd" credits. It is simple credit counting, suitable for implementation in hardware or software at any number of layers, and requires no additional wire messages or even fields.
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