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Re: [Openvpn-users] Re: Scalability?


  • Subject: Re: [Openvpn-users] Re: Scalability?
  • From: Charles Duffy <cduffy@xxxxxxxxxxx>
  • Date: Tue, 01 Mar 2005 14:43:34 -0600

On Tue, 2005-03-01 at 20:33 +0000, Jamie Lokier wrote:
> I suspect he means the CPU load of the public-key crypto and
> certificate checking at run time.  With 10000 clients, that's a lot of
> calculations.

I'd expect he'd probably be okay with a beefy enough server once
OpenVPN's multithreading support is back in place -- particularly if he
boosts the key renegotiation interval, or (even better) has a
client-connect script adding some random fuzz to the renegotiation
interval (so as to stagger renegotiations even if all the clients
initially connect at the same time).

There still might be some trouble as everyone reconnects after downtime
or a like event, but my guess is that it'd be workable. Be useful to
know a bit more about what he's trying to do (and thus how critical it
is for clients to reconnect promptly following downtime) to offer more
suggestions -- but one could conceive of having the client instances
configured to exit when disconnected from the server and running in a
supervised scripting loop that places a random amount of delay before
restarting the client instance; this would help to avoid the
everyone-pile-on-the-server effect.

James, what's the status of multithreading support?


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