FreeBSD 4.x and OS-X tcp performance

[Mark Tinguely]

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.