timestamps, tcp_paws_discard and out of order packets/acks (fwd)

Benjamin C.R. LaHaise (blah@kvack.org)
Sun, 18 Jul 1999 22:46:22 -0400 (EDT)

I'm resending this to linux-kernel as netdev hasn't sent out any messages
in the past week (at least to me).

---------- Forwarded message ----------
Date: Wed, 14 Jul 1999 20:15:21 -0400 (EDT)
From: "Benjamin C.R. LaHaise" <blah@kvack.org>
To: netdev@nuclecu.unam.mx
Subject: timestamps, paws and out of order packets/acks

Hello all,

I'm wondering if anyone has tackled the problem I pointed out a while ago
where an ack manages to arrive before data sent on the same connection
due, causing the tcp paws support in 2.2/2.3 to dump the data packet? The
traces at http://www.kvack.org/~blah/a.(leeloo|mole) are still valid
against 2.3.10, and the behaviour disappears when timestamps are disabled.
Debugging verified that tcp_paws_discard is the source of the packet
drops, specifically the second term (...tsval - tp->ts_recent) < 0.

-ben

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