<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">While I was a little late to the party (our TCP didn’t start to get written until early 1981), I don’t recall any discussion of GBN at the time. Perhaps that was a term of art invented later to describe all this. The retransmission mechanism was to send unacknowledged data from the "left window edge” of the TCP “send window”. By definition, that’s where all of the unacknowledged data in the sliding window existed.<div><br><div>The decision of how much data to send was implementation specific. I can’t imagine sending less than a whole TCP MSS on a retransmission attempt. <div><div><br></div><div>louie</div><div><br></div><div><br><div><div>On May 28, 2014, at 6:55 AM, Vint Cerf <<a href="mailto:vint@google.com">vint@google.com</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr">GBN is a funny way to characterize the process - the retransmission has to be limited by window permissions at least.<div><br></div><div>v</div><div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Wed, May 28, 2014 at 6:34 AM, Detlef Bosau <span dir="ltr"><<a href="mailto:detlef.bosau@web.de" target="_blank">detlef.bosau@web.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
My joy was a bit to early, this version doesn't contain the VJCC actions<br>
but uses cwnd for source quench. (To my understanding, from the<br>
congavoid paper, VJ introduced a state variable cwnd, obviously it is<br>
already present here?) However, I don't find the actions<br>
"window halving" on time out and for the window increase, I find a<br>
probing in case of missing source quenchs.<br>
<br>
Anyway, as far as I see at the moment, this code clearly does Go Back N<br>
in case of an expiring retransmission timer and timer backoff.<br>
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