linux-kernel - new ipdelay= option for faster netboot (was Re: New fast(?)-boot results on ARM)

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Date:	Mon, 17 Aug 2009 15:35:01 -0700
From:	Tim Bird <tim.bird@...sony.com>
To:	Robert Schwebel <r.schwebel@...gutronix.de>
CC:	Denys Vlasenko <vda.linux@...glemail.com>,
	linux-kernel@...r.kernel.org, linux-embedded@...r.kernel.org,
	Arjan van de Ven <arjan@...ux.intel.com>,
	kernel@...gutronix.de
Subject: new ipdelay= option for faster netboot (was Re: New fast(?)-boot
 results on ARM)

Tim Bird wrote:
> See the definitions of CONF_PRE_OPEN and CON_POST_OPEN
> in net/ipv4/ipconfig.c
> 
> They are set to ridiculously long values.  In my experience,
> you can cut them down considerably with no dangerous side
> effects (but I haven't asked the network guys about the
> possible downsides).

It turns out that others have seen this delay.  Simon
Arlott recently posted a patch to make the delay avoidable
at boot time from the kernel command line.

See http://patchwork.kernel.org/patch/31678/
 -- Tim

=============================
Tim Bird
Architecture Group Chair, CE Linux Forum
Senior Staff Engineer, Sony Corporation of America
=============================

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