netdev - Re: tcp_mtu_probe implementation details

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Message-ID: <op.v6z4rcupfzo5me@stalin>
Date:	Sat, 24 Dec 2011 20:15:02 +0400
From:	"Anatoly Sivov" <mm05@...l.ru>
To:	"John Heffner" <johnwheffner@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: tcp_mtu_probe implementation details

Hello John,

Thanks for clarifications.

> A cwnd of 11 pre-probe will result in a cwnd of 6 after a successful
> probe.  (By the time the probe succeeds, cwnd will have been increased
> to 12, then doubling MSS will halve cwnd to 6.)  A window size smaller
> than this makes TCP more vulnerable to double loss events and
> increases the likeliness of timeouts.

Perhaps, it's worth of being mentioned in comment inside of tcp_mtu_probe.
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