netdev - [PATCH] Fix tcp_hybla zero congestion window growth with small rho and large cwnd

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Message-ID: <48EA4A4D.5090103@danielinux.net>
Date:	Mon, 06 Oct 2008 19:26:37 +0200
From:	Daniele Lacamera <root@...ielinux.net>
To:	shemminger@...tta.com, davem@...emloft.net
CC:	netdev@...r.kernel.org, Carlo Caini <ccaini@...es.unibo.it>,
	rfirrincieli@...es.unibo.it
Subject: [PATCH] Fix tcp_hybla zero congestion window growth with small rho
 and large cwnd

(Sorry for repost, but I've got no reply.)

Because of rounding, in certain conditions, i.e. when in congestion
avoidance state rho is smaller than 1/128 of the current cwnd, TCP Hybla
congestion control starves and the cwnd is kept constant forever.

This patch forces an increment by one segment after #snd_cwnd calls
without increments(newreno behavior).

Please apply.

Signed-off-by: Daniele Lacamera <root@...ielinux.net>

View attachment "hybla_not_incrementing_cwnd.patch" of type "text/x-diff" (578 bytes)