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From: David Miller <davem@davemloft.net>
Subject: Re: txqueuelen has wrong units; should be time
Date: Mon, 28 Feb 2011 23:25:02 -0800 (PST)
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From: Albert Cahalan <acahalan@gmail.com>
Date: Tue, 1 Mar 2011 01:54:09 -0500

> In case it makes you feel any better, consider two cases
> where synchronous feedback is already impossible.
> One is when you're routing packets that merely pass through.
> The other is when some other box is doing that to you.
> Either way, packets go bye-bye and nobody tells TCP.

I consider ECN quite synchronous, and routers will set ECN bits to
propagate congestion information when they do or are about to drop
packets.