netdev - RE: [RFC][PATCH] net: ipv4: ipconfig: decrease CONF_CARRIER

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Date:	Wed, 2 May 2012 16:59:16 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Christian Hemp" <c.hemp@...tec.de>, <davem@...emloft.net>,
	<kuznet@....inr.ac.ru>, <jmorris@...ei.org>,
	<yoshfuji@...ux-ipv6.org>, <kaber@...sh.net>,
	<netdev@...r.kernel.org>
Subject: RE: [RFC][PATCH] net: ipv4: ipconfig: decrease CONF_CARRIER_TIMEOUT

 
> A timeout of two minutes is pretty anoying if _no_ ethernet cable
> is attached by purpose.  This patch decreases the timeout of
> CONF_CARRIER_TIMEOUT to an accaptable value of 10 secounds.
> 
...
>  
>  /* Define the friendly delay before and after opening net devices */
>  #define CONF_POST_OPEN		10	/* After 
> opening: 10 msecs */
> -#define CONF_CARRIER_TIMEOUT	120000	/* Wait for carrier timeout */
> +#define CONF_CARRIER_TIMEOUT	1000	/* Wait for carrier timeout */

Doesn't that reduce it to 1 second!

I'm also not all sure how long it might take.
I'm sure there are some switches/routers that can take quite a while
do negotiate the link.
Usually noticed when dhcp takes links down and up as it assigns
an address.

	David


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