netdev - Re: [PATCH] tcp: Socket option to set congestion window

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Date:	Thu, 27 May 2010 10:00:25 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	David Miller <davem@...emloft.net>
Cc:	andi@...stfloor.org, therbert@...gle.com, shemminger@...tta.com,
	netdev@...r.kernel.org, ycheng@...gle.com
Subject: Re: [PATCH] tcp: Socket option to set congestion window

On Wed, May 26, 2010 at 03:10:14PM -0700, David Miller wrote:
> From: Andi Kleen <andi@...stfloor.org>
> Date: Wed, 26 May 2010 23:27:45 +0200
> 
> > As I understand the idea was that the application knows
> > what flows belong to a single peer and wants to have
> > a single cwnd for all of those. Perhaps there would
> > be a way to generalize that to tell it to the kernel.
> > 
> > e.g. have a "peer id"  that is known by applications
> > and the kernel could manage cwnds shared between connections
> > associated with the same peer id?
> > 
> > Just an idea, I admit I haven't thought very deeply
> > about this. Feel free to poke holes into it.
> 
> Yes, a CWND "domain" that can include multiple sockets is
> something that might gain some traction.
> 
> The "domain" could just simply be the tuple {process,peer-IP}

If process is in there this wouldn't work for a multi process
server?

Perhaps having it associated with a FD so that it could
be passed around with unix sockets if needed (just would
need to make sure the AF_UNIX gc can handle such cycles)

peer_id = open_peer_id();   
/* peer id is like a fd */

socket = socket( ... ); 
set_peer_id(socket, peer_id); 


...

close(peer_id);

-andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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