netdev - Re: [PATCH] make _minimum_ TCP retransmission timeout configurable

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Date:	Wed, 29 Aug 2007 16:15:28 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	rick.jones2@...com
Cc:	ian.mcdonald@...di.co.nz, netdev@...r.kernel.org,
	ilpo.jarvinen@...sinki.fi
Subject: Re: [PATCH] make _minimum_ TCP retransmission timeout configurable

From: Rick Jones <rick.jones2@...com>
Date: Wed, 29 Aug 2007 16:06:27 -0700

> I belive the biggest component comes from link-layer retransmissions. 
> There can also be some short outtages thanks to signal blocking, 
> tunnels, people with big hats and whatnot that the link-layer 
> retransmissions are trying to address.  The three seconds seems to be a 
> value that gives the certainty that 99 times out of 10 the segment was 
> indeed lost.
> 
> The trace I've been sent shows clean RTTs ranging from ~200 milliseconds 
> to ~7000 milliseconds.

Thanks for the info.

It's pretty easy to generate examples where we might have some sockets
talking over interfaces on such a network and others which are not.
Therefore, if we do this, a per-route metric is probably the best bet.

Ilpo, I'm also very interested to see what you think of all of this
:-)
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