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From: "David S. Miller" <davem@redhat.com>
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Date: Sat, 3 Mar 2001 01:11:01 -0800 (PST)
To: Mark Reginald James <mrj@bigpond.net.au>
Cc: linux-kernel@vger.kernel.org
Subject: Re: TCP Congestion Window Bug?
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Mark Reginald James writes:
 > TCP only sends a packet if:
 > 
 >          tcp_packets_in_flight(tp) < tp->snd_cwnd
 > 
 >          (function tcp_snd_test in include/net/tcp.h)
 > 
 > but regards transmission as application-limited if
 > 
 >          tp->packets_out < tp->snd_cwnd
 > 
 >          (function tcp_cwnd_validate in include/net/tcp.h)
 > 
 > So the kernel _always_ thinks the connection is
 > application-limited

Why?  After the final "send a packet if" test, tp->packets_out will be
incremented and thus be equal to tp->snd_cwnd, marking the connection
as _not_ application limited.

Later,
David S. Miller
davem@redhat.com
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