🚀 go-pugleaf

From: David C. Plummer in disguise <DCP@SCRC-QUABBIN.ARPA>

    Date: Tue 30 Jul 85 10:57:15-EDT
    From: Lixia Zhang <Lixia@MIT-XX.ARPA>

    Could  someone tell me if there is/are TCP imlementations that withhold
    acknowledgment packets?
    And if so, are they the majority?  and how do they do it?

    (I've read rfc813 by Dave Clark on that topic, but I'd like to know
    whether/how it is implemented.)

The Symbolics implementation for 3600s sets a flag in a connection
saying "send an ack when you get a chance."  Therefore, we do withhold
ACKs in a sense.  

If by withholding acks you are thinking about avoiding silly-window
syndrome, that is NOT withholding acks, that is withholding window
enlargments.  Our implementation does that too.  I think just about
every implementation does these days.  It isn't hard.  (It's a bit
easier if you deal with limit sequence numbers instead of base+count,
since limits stay constant while base increases and count decreases, and
just makes my brain hurt making sure they increase/decrease by the same
amount...)