linux-kernel - Re: Thousands of interfaces

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Message-ID: <20061031102222.7ab1ed6b@freekitty>
Date:	Tue, 31 Oct 2006 10:22:22 -0800
From:	Stephen Hemminger <shemminger@...l.org>
To:	David Miller <davem@...emloft.net>
Cc:	peter.hicks@...gs.co.uk, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: Thousands of interfaces

On Tue, 31 Oct 2006 01:31:54 -0800 (PST)
David Miller <davem@...emloft.net> wrote:

> From: Peter Hicks <peter.hicks@...gs.co.uk>
> Date: Tue, 31 Oct 2006 09:25:50 +0000
> 
> [ Discussion belongs on netdev@...r.kernel.org, added to CC: ]
> 
> > I have a dual 3GHz Xeon machine with a 2.4.21 kernel and thousands (15k+) of
> > ipip tunnel interfaces.  These are being used to tunnel traffic from remote
> > routers, over a private network, and handed off to a third party.
>  ...
> > Is it possible to speed up creation of the interfaces?  Currently it takes
> > around 24 hours.  Is there are more efficient way to handle a very large
> > number of IP-IP tunnels?  Would upgrading to a 2.6 kernel be of use?
> 


2.4 has a several N^2 searches for interfaces (and is in deep freeze by now).
2.6 had several changes to handle 1000's of interfaces.


-- 
Stephen Hemminger <shemminger@...l.org>
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