Daniel Schaffrath wrote:
Maybe this is the right place to ask?
Thanks again,
Daniel
Begin forwarded message:
From: Daniel Schaffrath <daniel.schaffrath@mac.com>
Date: 21 July 2007 11:01:01 GMT+02:00
To: linux-net@vger.kernel.org
Subject: PFIFO to contain more pkts than allowed by TCP peer?
Hello everybody,
when the one and only connection originating my box is a TCP stream
which is limited by the advertised window of my peer at - lets say -
47 pkts, I would expect 'tc -s qdisc show' to show at most 47 pkts in
the pfifo of the appropriate device. Unfortunately, this is not the
case. It's around 83 (twice as much??). Anyone any hints how come?
Maybe tcp window scaling - you can tcpdump the syn/syn ack of the
connection to see what if any scale factors are being used.
If pfifo is just on the root of a device rather than as a child of
something that retelimits, then there could be 100s of packets in a
further buffer before you even see a backlog.
Andy.
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