netdev - Re: TCP default congestion control in linux should be newreno

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Date:	Thu, 04 Dec 2008 12:47:47 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	saverio.mascolo@...il.com
Cc:	ldecicco@...il.com, ilpo.jarvinen@...sinki.fi,
	netdev@...r.kernel.org
Subject: Re: TCP default congestion control in linux should be newreno

From: "Saverio Mascolo" <saverio.mascolo@...il.com>
Date: Thu, 4 Dec 2008 21:05:37 +0100

> > The bigger problem is that windows are so much larger now that going
> > back to the stone ages and newreno recovery behavior is absolutely not
> > an option any more.
> 
> average window cannot be much larger, because average windows  follow
> network capacity in any case. so you can end up having only more
> oscillating windows (i.e. more timeouts, more retransmissions)

But a lost based fast recovery is more expensive unless you
modify the congestion window handling, reno simply does
not scale.
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