netdev - Re: [PATCH] make _minimum_ TCP retransmission timeout configurable take 2

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Message-Id: <20070830.173912.79067694.davem@davemloft.net>
Date:	Thu, 30 Aug 2007 17:39:12 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	rick.jones2@...com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] make _minimum_ TCP retransmission timeout configurable
 take 2

From: Rick Jones <rick.jones2@...com>
Date: Thu, 30 Aug 2007 17:09:04 -0700 (PDT)

> Enable configuration of the minimum TCP Retransmission Timeout via
> a new sysctl "tcp_rto_min" to help those who's networks (eg cellular)
> have quite variable RTTs avoid spurrious RTOs.
> 
> Signed-off-by: Rick Jones <rick.jones2@...com>
> Signed-off-by: Lamont Jones <lamont@...com>

Thanks for doing this work Rick.

But as John Heffner and I both mentioned, it's pretty clear we should
do this as a routing metric.  Both for handling realistic scenerios
where the sysctl doesn't work, and to help prevent misuse (example:
someone decides that it would be _totally_ _awesome_ for "Carrier
Grade Linux" to set this to 3 seconds by default in /etc/sysctl.conf
and crap like that).
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