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Date: Fri, 11 Mar 2005 08:59:40 -0600 (CST)
From: Mark Tinguely <tinguely@casselton.net>
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To: demizu@dd.iij4u.or.jp, freebsd-net@freebsd.org
In-Reply-To: <20050311.202002.26516944.Noritoshi@Demizu.ORG>
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Subject: Re: FreeBSD 4.x and OS-X tcp performance
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on Fri, 11 Mar 2005 20:20:02 +0900 (JST), Noritoshi Demizu said:

>    ack 4195629532 win 5792 (-)		<- Original ACK
>    ack 4195629532 win 6576 (+784)	<- dup   ACK (with window update)
>    ack 4195629532 win 6576 (0)		<- dup ACK
>    ack 4195629532 win 7240 (+664)	<- dup   ACK (with window update)
>    ack 4195629532 win 10672 (+3432)	<- window update

The Apple machine may be rate limiting their transmissions. The Apple is
sending only 2 packets per round trip time. After the packet is lost,
that gap allows the FreeBSD to consume some data before sending the 3rd
duplicate ACKs and so it has a window changes.

--Mark.