linux-kernel - Re: A kexec approach to hibernation

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Message-Id: <1181576723.11365.45.camel@frg-rhel40-em64t-04>
Date:	Mon, 11 Jun 2007 17:45:23 +0200
From:	Xavier Bestel <xavier.bestel@...e.fr>
To:	Jeremy Maitin-Shepard <jbms@....edu>
Cc:	nigel@...el.suspend2.net, "Rafael J. Wysocki" <rjw@...k.pl>,
	linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...l.org>,
	Pavel Machek <pavel@....cz>
Subject: Re: A kexec approach to hibernation

On Mon, 2007-06-11 at 11:01 -0400, Jeremy Maitin-Shepard wrote:
> >> You might claim then that the solution is to simply keep the network
> >> driver quiesced or stopped.  But then it is impossible to write the
> >> image over the network.  The way to get around this problem is to write
> >> the image over the network using a fresh network stack.
> 
> > Or teach the driver stack about the difference/reset it. Remember that
> > even if you get a fresh network stack, you'll still be getting packets
> > for the old stack. Getting a new ip (assuming one is available) won't
> > stop other connections getting killed, either because we send resets
> > from the kexec'd kernel, or because they timeout looking for the old
> > ip.
> 
> I could be mistaken, but I think that bringing up the network interface
> with a different IP address would prevent it from reseting existing TCP
> connections, because it would never receive the packets for those
> existing connections.  

That can't work. There are networks where the client must have a fixed
IP, or must accept the adress given by dhcp in order to talk to
fileservers. And you still have the same mac adress, which may cause
problems.

	Xav


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