netdev - Re: How I can reset TCP sockets after long suspend/resume cyscle

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Date:	Fri, 6 Jun 2008 12:27:47 +0300
From:	Nadejda Levitsky <maximlevitsky@...il.com>
To:	Benny Amorsen <benny+usenet@...rsen.dk>
Cc:	netdev@...r.kernel.org
Subject: Re: How I can reset TCP sockets after long suspend/resume cyscle

On Friday, 6 June 2008 11:37:12 Benny Amorsen wrote:
> Maxim Levitsky <maximlevitsky@...il.com> writes:
> 
> > This seems the right solution,
> > if this is possible, why not to check for stuck TCP connections
> > on resume?
> 
> Imagine a laptop on wireless going into suspend for a few minutes,
> then getting woken up. If you're lucky today, the TCP connections
> survive.
It depends, I for example don't care about TCP connecions survival during suspend
I would even like to close them on suspend. (I usially use web browser, chat client, mail
maybe a download running in background which can be resumed)

Like I said such feature can be user configured.
There are uses like hibernating your server to change power supply, and still save all
TCP connections.



> 
> If you check for stuck TCP connections right after resume, you could
> have problems because the wireless hasn't negotiated encryption keys
> at that point. Isn't that a concern?

Good point, I haven't thought about this.
This means that a in-kernel solution is no-go, but userland solution
can check for such connections _after_ negotiation of wireless keys.

Or, just close all remote TCP connections if the suspend was long enough.



> 
> 
> /Benny
> 

Best regards,
	Maxim Levitsky
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