netdev - Re: txqueuelen has wrong units; should be time

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Message-Id: <20110228.232502.226763923.davem@davemloft.net>
Date:	Mon, 28 Feb 2011 23:25:02 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	acahalan@...il.com
Cc:	johnwheffner@...il.com, linville@...driver.com,
	eric.dumazet@...il.com, jussi.kivilinna@...et.fi, swmike@....pp.se,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: txqueuelen has wrong units; should be time

From: Albert Cahalan <acahalan@...il.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.
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