netdev - Re: [PATCH] tcp: Socket option to set congestion window

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Message-Id: <20100526.003307.112602435.davem@davemloft.net>
Date:	Wed, 26 May 2010 00:33:07 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	therbert@...gle.com
Cc:	shemminger@...tta.com, netdev@...r.kernel.org, ycheng@...gle.com
Subject: Re: [PATCH] tcp: Socket option to set congestion window

From: Tom Herbert <therbert@...gle.com>
Date: Wed, 26 May 2010 00:06:35 -0700

> It's really not that simple.  In the application with multiple
> connections, congestion may only affect some number of connections, so
> more of the aggregate window may be preserved.  This is an unfairness
> issue between 1 and N connection scenarios which is a real problem.

If this is true, then by all account your patch allows things to be
even worse.

Because now applications can still open up N connections, but with an
even larger initial CWND, with potentially exponential ramifications
on network congestion.

So yet another reason not to consider this feature seriously.  It's
not an application level attribute, it's a network path one.  Please
take it seriously because I really mean it.
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