Re: [tcpm] Fwd: I-D Action:draft-cheng-tcpm-fastopen-00.txt

Hi Yuchung,

your proposal will only address new tcp sessions preceeded by one "normal" 3WHS session setup. 

In the draft, you mention that Chrome keeps persistent connections for up to 4 min, while 35% of the requests are made using new sessions; Now I wonder, what fraction of these new sessions are set up towards a server, where the client already had an earlier normal session (or, what is the fraction of persistent connections, that get disconnected within that 4 min timeout due to external reasons such as a NAT gateways running out of resources, or into a timeout...)

Because that 35% value above appears to throw genuinely "new" sessions (new sites) and "lost" sessions (timed out, reset by intermediate device or server etc) to a known host into the same bucket - unless the wording around there is misleading me J

(Since I know how you value even small sub-1% improvements, I do see how this can help you, but I'm wondering if the complexity is worthwhile for a generic tcp stack that deals mostly with non-http'ish traffic).

Best regards, 

Richard Scheffenegger

From: Yuchung Cheng [mailto:ycheng@google.com] 
Sent: Freitag, 11. März 2011 20:05
To: tcpm@ietf.org Extensions
Cc: Mike Belshe; Sivasankar Radhakrishnan; Arvind Jain
Subject: [tcpm] Fwd: I-D Action:draft-cheng-tcpm-fastopen-00.txt

Hi folks,

We are proposing a new draft called TCP Fast Open (TFO) which allows data exchange to begin in TCP handshake to improve performance.

We would like to gather some comments before we present it in the next tcpm meeting in Prague. The presentation will also include some performance numbers based on our beta implementation in Linux and the Chrome browser.

Thanks,

Yuchung

---------- Forwarded message ----------

From: <Internet-Drafts@ietf.org>
Date: Mon, Mar 7, 2011 at 4:45 PM
Subject: I-D Action:draft-cheng-tcpm-fastopen-00.txt
To: i-d-announce@ietf.org

A New Internet-Draft is available from the on-line Internet-Drafts directories.

       Title           : TCP Fast Open
       Author(s)       : Y. Cheng, et al.
       Filename        : draft-cheng-tcpm-fastopen-00.txt
       Pages           : 17
       Date            : 2011-03-07

TCP Fast Open (TFO) allows data to be carried in the SYN or SYN-ACK
packets and consumed by the receiving end during the initial
connection handshake, thus providing a saving of up to one full round
trip time (RTT) compared to standard TCP requiring a three-way
handshake (3WHS) to complete before data can be exchanged.

A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-cheng-tcpm-fastopen-00.txt

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