Re: MPA alignment
"Eddy Quicksall" <[email protected]>
| Newsgroups | gmane.ietf.ips |
|---|---|
| Message-ID | <[email protected]> |
Thanks, Here is my feeling on this. If one were to use a standard TCP/IP stack (that does copying) then it is a bit silly to use iSER. If one were to use a software implementation and write/modify the stack to get the desired effects of DDP then he will probably heed to the alignment notes in the spec. So if one were to support misaligned segments using a slower method then it would be OK. Eddy ----- Original Message ----- From: Mike Ko To: Eddy Quicksall Cc: [email protected] Sent: Tuesday, April 18, 2006 2:16 AM Subject: Re: [Ips] MPA alignment Eddy, If your question is about MPA behavior in general, then it should be directed to the rddp forum. Assuming your question is related to iSER, then if iWARP is implemented in software and uses the existing TCP/IP stack, then it cannot guarantee that FPDU's will be aligned with TCP segments. For the general case where iWARP is implemented in an RNIC with an integrated TCP/IP stack, then it is to the RNIC vendor's advantage to optimize his product's performance and therefore FPDU's should be aligned with TCP segments. However, the receiver can still receive FPDU's which are not aligned with TCP segments if there are resegmenting middleboxes somewhere in the connection path. Mike To: <[email protected]> cc: Subject: [Ips] MPA alignment It is preferable to have TCP sender to align MPA header where a TCP segment begins and to keep the MPA FPDU within a TCP segment, so that the receiver hardware doesn't need to temporarily buffer the FPDU for the CRC checking. Does anyone know of any software or hardware that is not an FPDU alignment sender? Does anyone have a feel for the likelihood of software or hardware to not align FPDU's on a TCP segment? Eddy_______________________________________________ Ips mailing list [email protected] https://www1.ietf.org/mailman/listinfo/ips ------------------------------------------------------------------------------ _______________________________________________ Ips mailing list [email protected] https://www1.ietf.org/mailman/listinfo/ips _______________________________________________ Ips mailing list [email protected] https://www1.ietf.org/mailman/listinfo/ips