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From: tcp-ip@ucbvax.ARPA
Newsgroups: fa.tcp-ip
Subject: Re: Withholding Acks
Message-ID: <9689@ucbvax.ARPA>
Date: Mon, 5-Aug-85 20:49:45 EDT
Article-I.D.: ucbvax.9689
Posted: Mon Aug  5 20:49:45 1985
Date-Received: Tue, 6-Aug-85 12:40:28 EDT
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Organization: University of California at Berkeley
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From: MILLS@USC-ISID.ARPA

In response to the message sent  Sun 4 Aug 85 20:13:23-EDT from Lixia@MIT-XX.ARPA

Lixia,

Further to my previous message, the fuzzy ones do in fact produce fewer
acks than received segments on average, far fewer in the case of tinygram
(interactive) traffic due to the 500-millisecond left-window edge delay.
In typical character-at-a-time traffic with TELNET, twinkling on the
keys results in no unpiggybacked acks at all - just tinygrams. The send
policy and ack policy then result in a packet exchange between the user and
server every 500 milliseconds with whatever queues up in the interval
in the segment. Watch a Unix, TOPS-20 or especially a PCIP for somewhat less
efficient behavior (!).

Dave
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