RE: Framing (was RE: iSCSI: new draft)

["KRUEGER,MARJORIE (HP-Roseville,ex1)" <marjorie_krueger@hp.com>]

..snip..
>>  And if it did, what will it do in the TCP layer to
>> indicate those "out of order" bytes have already been delivered?
> 
> It won't be able to do anything in the TCP layer to indicate 
> those bytes have been delivered. 
 
Is this where you are thinking of using some sort of "score boarding"
to keep track of what bytes in a receive buffer have been "resolved" and
what bytes are currently outstanding?  Cause if TCP doesn't 
somehow know these "out of order bytes" have 
been moved "to the correct place",  won't it "deliver" them
again to iSCSI when the missing segment is recovered?

> That would break the existing TCP model.  
> The only thing it could do is use the SACK option to help the sending TCP 
> reduce the amount of retransmitted data.

Does "it" refer to TCP or the iSCSI intervention?  I assume you mean "an
iSCSI/TCP optimized adapter would use SACK"...?
 
> -Matt Wakeley
> Agilent Technologies
>

-Marjorie