From: Zongsheng Zhang <zhang@ist.osaka-u.ac.jp>
To: linux-kernel@vger.kernel.org
Subject: TCP fast retransmit/recovery
Date: Wed, 25 Jan 2006 20:10:52 +0900 [thread overview]
Message-ID: <43D75CBC.9040805@ist.osaka-u.ac.jp> (raw)
Hi,
About TCP fast retransmit/recovery, it is described in RFC 2581:
1) When the third duplicate ACK is received, set ssthresh to no more
than the value max(FlightSize/2, 2*SMSS).
2) Retransmit the lost segment and set cwnd to ssthresh plus 3*SMSS.
However, in kernel 2.4.31 (or 2.6.15), cwnd is always set to 1 (in
tcp_enter_loss()), even there is only one packet is drop.
Does anyone know the reason?
Regards,
--
Zongsheng Zhang
zhang@ist.osaka-u.ac.jp
reply other threads:[~2006-01-25 11:11 UTC|newest]
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