Re: iSCSI: Urgent Pointer Negotation

["John Hufferd/San Jose/IBM" <hufferd@us.ibm.com>]

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John L. Hufferd
Senior Technical Staff Member (STSM)
IBM/SSG San Jose Ca
(408) 256-0403, Tie: 276-0403
Internet address: hufferd@us.ibm.com


csapuntz@cisco.com@ece.cmu.edu on 11/15/2000 06:33:16 PM

Sent by:  owner-ips@ece.cmu.edu


To:   ips@ece.cmu.edu
cc:   csapuntz@cisco.com
Subject:  iSCSI: Urgent Pointer Negotation




If the URG pointer feature is to be used, it should be negotiated.

The reason it should be negotiated is that the presence of the URG
pointer takes many TCP receive stacks off of their fast path. I am
not familiar with whether it significantly slows current TCP send stacks.

Each half of the connection should be negotiated separately. This
deals with a hardware accelerator on one side and a software
implementation on the other.

Cheers,
-Costa