netdev - Re: [PATCH] tcp: Increase the initial congestion window to 10.

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Message-ID: <47859e9273bb0c1b2c32fc1adfa450ee@localhost>
Date:	Thu, 03 Feb 2011 15:00:28 +0100
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	David Miller <davem@...emloft.net>
Cc:	<netdev@...r.kernel.org>, <dccp@...r.kernel.org>,
	<therbert@...gle.com>
Subject: Re: [PATCH] tcp: Increase the initial congestion window to 10.

On Wed, 02 Feb 2011 17:07:50 -0800 (PST), David Miller wrote:

> +/* TCP initial congestion window */
> +#define TCP_INIT_CWND		10
> +

Davem, there is _no_ research how this huge IW will behave in environments
with a small BDP. Belief it or not, but there are networks out there with a
BDP similar to ~1980. Why for heaven's sake should this work in these
environments? There are only _two_ extensive analysis one from Cherry and
and one from Ilpo. Both analysis focus on current mainstream BDP. I started
to setup a ns-2 environment but due to lack of time I am a little bit
behind schedule. Anyway, why not make this a tunable per route knob so that
it is easier to fix things, e.g. set IW back to 3.

HGN
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