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Re: [Openvpn-users] LJ's "cons" of OpenVPN: how serious is latency?


  • Subject: Re: [Openvpn-users] LJ's "cons" of OpenVPN: how serious is latency?
  • From: Florin Andrei <florin@xxxxxxxxxxxxxxx>
  • Date: Tue, 21 Dec 2004 21:30:01 -0800

On Wed, 2004-12-22 at 15:19 +1300, Jason Haar wrote:

> Client -> VPN-software -> Oz -> Internet -> Canada -> VPN-software -> Server
> 
> now - where do you think the bottleneck is :-)
> 
> userland vs kernelland VPN/crypto performance issues are going to PALE 
> INTO INSIGNIFICANCE compared with the 200-400ms latency you will have on 
> that long-haul between Canada and Australia.

Hm, one of these days i'll actually do some benchmarks. Just for the
heck of it. See what's the latency over plain Ethernet compared to
OpenVPN. See what's the latency over plain 802.11g compared to OpenVPN.

There's this sudden preocupation with latency, which i believe it's a
false problem. There's no latency worth worrying about. Worry about
security and proper management of the keys, worry about bandwidth usage
and all the other _real_ problems.

As for the TLS negotiation latency that Jim mentioned: even if it would
be noticeable, for normal applications nobody cares about a small blip
that occurs once every hour. But, yeah, with buffers and all, it
shouldn't be noticeable at all.

-- 
Florin Andrei

http://florin.myip.org/


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