RE: A Transport Protocol Without ACK

[Stephen Byan <Stephen.Byan@quantum.com>]

Y P Cheng [mailto:ycheng@advansys.com] wrote:

> While the work group 
> thinks we should
> take advantage the flow control and congestion management of 
> TCP/IP, there
> are alternatives known as BB-credit and EE-credit management. 

These are flow control mechanisms, not congestion control mechanisms. Fibre
channel and InfiniBand do not have congestion control of any sort.

>  The fibre
> channel adapters make reliable delivery, lost packet detection, and
> retransmission without TCP/IP.
> 
> Randall, you are right, I did not spent time to provide the 
> working group a
> draft defining such transaction-oriented protocol.  All I 
> have provided is
> an idea that besides TCP/IP.  The designers for SCSI and fibre channel
> adapters have solved the head-of-queue blocking, the congestion, and
> retransmission problems.  

They have not solved the congestion problem. Please read RFC RFC 2914
"Congestion Control Principles" and RFC 896 "Congestion Control in IP/TCP
Internetworks".

Regards,
-Steve

Steve Byan
<stephen.byan@quantum.com>
Design Engineer
MS 1-3/E23
333 South Street
Shrewsbury, MA 01545
(508)770-3414
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