linux-kernel - Re: Back to the future.

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Message-Id: <CF6D1CC2-4B42-4FF9-821F-C54C4553D710@mac.com>
Date:	Sun, 6 May 2007 23:33:11 -0400
From:	Kyle Moffett <mrmacman_g4@....com>
To:	David Lang <david.lang@...italinsight.com>
Cc:	Pavel Machek <pavel@....cz>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pekka J Enberg <penberg@...helsinki.fi>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Back to the future.

On May 06, 2007, at 22:13:51, David Lang wrote:
> anyone who is doing a hibernate or suspend who expect all the  
> network connections to be working afterwords is dreaming or  
> smokeing something.
>
> this is just another way that the failure can show up.
>
> in fact, I would say that it would probalby be a nice thing to do  
> for intervening firewalls and external servers if a suspend closed  
> all external TCP connections rather then leaving them dangling  
> (eating up resources until they time out)
>
> if you software can't tolorate the network connection going away on  
> you it will have problems in normal operation anyway, let alone  
> when you suspend/hibernate your machine.

Yeah, for suspend-to-ram+resume and for snapshot+restore you probably  
want userspace to support some kind of initscript-like mechanism  
which is triggered by the lid-switch or something before calling into  
the kernel.  That way it can close network connections mostly-nicely  
and down network interfaces before suspending, then re-run DHCP/ 
802.11/whatever configuration after resume/restore.  That might not  
be a bad place to handle NFS mounts and such too.

Cheers,
Kyle Moffett

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