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    SubjectRe: Thousands of interfaces
    From
    From: Stephen Hemminger <shemminger@osdl.org>
    Date: Tue, 31 Oct 2006 10:22:22 -0800

    > On Tue, 31 Oct 2006 01:31:54 -0800 (PST)
    > David Miller <davem@davemloft.net> wrote:
    >
    > > From: Peter Hicks <peter.hicks@poggs.co.uk>
    > > Date: Tue, 31 Oct 2006 09:25:50 +0000
    > >
    > > [ Discussion belongs on netdev@vger.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.

    Oops I didn't notice this was with 2.4.x. Indeed, 2.4.x definitely
    cannot handle large numbers of networking interfaces at all without
    major surgery. 2.6.x should handle this significantly better.
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