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tcplw-minutes-90feb.txt
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1993-02-17
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CURRENT_MEETING_REPORT_
Reported by Craig Partridge/BBN
MINUTES
The working group made progress on deciding what to do about the options
to support large TCP windows.
Key concerns were making the window size big enough so that a full
window could fill a gigabit pipe and expanding the sequence space large
enough that it wouldn't be consumed too fast at a gigabit.
The WG made the following tentative decisions about how to deal with big
windows:
1. The RFC 1072 window shift option will be used to expand the window
size (everyone likes it, and implementation is a snap).
2. We'll create a new Urgent Pointer option so it can point to urgent
data anywhere in the expanded window. (To use it, the URG bit is
left off -- when the receiver processes options, it will see that
there is urgent data).
3. The WG was divided among two options for expanded the sequence and
ack space. Thankfully some folks with supercomputers offerred to
implement both options and report back this spring. The two
options were:
(a) since we need an URG option anyway, steal the urgent field in
the TCP header to get 8 more bits for each of the sequence #
and the ack #. These would be high order bits.
(b) don't futz with the header (note that in most cases urgent data
is likely to be within 2**16 of the current sequence number and
thus the urgent field is still useful). Instead, put an option
at the end of each segment header, which contains an additional
high order 16-bits of the sequence number and the ack number.
Based on the implementation experience, the WG will decide which path to
take.
People interested in participating in the experiment should contact Dave
Borman (dab@cray.com).
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ATTENDEES
Doug Bagnall bagnall_d@apollo.hp.com
Dave Borman dab@cray.com
Richard Fox sytek!rfox@sun.com
Mike Karels karels@berkeley.edu
Walt Lazear lazear@gateway.mitre.org
Paul Love loveep@sds.sdsc.edu
Gary Malkin gmalkin@proteon.com
Paul E. McKenney mckenney@sri.com
Don Merritt don@brl.mil
Lee Oattes oattes@utcs.utoronto.ca
Craig Partridge craig@bbn.com
K.K. Ramakrishnan rama@dsmial.dec.com
Joel Replogle replogle@ncsa.uiuc.edu
Frank Solensky solensky@interlan.com
Mike St. Johns stjohns@umd5.umd.edu
Allen Sturtevant sturtevant@ccc.nmfecc.gov
Rick Wilder rick@gateway.mitre.org
Brian Yasaki bky@twg.com
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