netdev - Re: [PATCH 2.6.22-rc5] TCP: Make TCP_RTO

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Message-ID: <20070625090844.57a9f9e3@freepuppy.localdomain.hemminger.net>
Date:	Mon, 25 Jun 2007 09:08:44 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	OBATA Noboru <noboru.obata.ar@...achi.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 2.6.22-rc5] TCP: Make TCP_RTO_MAX a variable

On Mon, 25 Jun 2007 15:15:14 +0200
Patrick McHardy <kaber@...sh.net> wrote:

> OBATA Noboru wrote:
> > From: OBATA Noboru <noboru.obata.ar@...achi.com>
> > 
> > Make TCP_RTO_MAX a variable, and allow a user to change it via a
> > new sysctl entry /proc/sys/net/ipv4/tcp_rto_max.  A user can
> > then guarantee TCP retransmission to be more controllable, say,
> > at least once per 10 seconds, by setting it to 10.  This is
> > quite helpful on failover-capable network devices, such as an
> > active-backup bonding device.  On such devices, it is desirable
> > that TCP retransmits a packet shortly after the failover, which
> > is what I would like to do with this patch.  Please see
> > Background and Problem below for rationale in detail.
> 
> 
> Would it make sense to do this per route?
> 
Both global sysctl and per route would be useful additions.

-- 
Stephen Hemminger <shemminger@...ux-foundation.org>
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