Re: 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_______________________________________________
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