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Re: [Openvpn-users] OpenVPN 2.1 performance tests

  • Subject: Re: [Openvpn-users] OpenVPN 2.1 performance tests
  • From: Les Mikesell <lesmikesell@xxxxxxxxx>
  • Date: Wed, 30 May 2007 14:58:48 -0500

Florin Andrei wrote:
> Purpose: To determine the maximum file transfer speed and bandwidth
> usage with OpenVPN 2.1 on recent hardware (early 2007) and Linux. The
> file transfer protocols used in the tests were HTTP, FTP and NFS.
> Results - executive summary:
> - all 3 protocols (HTTP, FTP, NFS) exhibit very similar transfer speeds
> - file transfer speeds with a quad-core 2.4GHz 64 bit Linux VPN server
> are in the region of 14 ... 22 Mbyte / sec (only one core is actually
> used by OpenVPN)
> - bandwidth usage is in the region of 8 ... 22 Mbyte / sec
> - the limiting factor is the CPU speed on the VPN server

Thanks for posting this. Did you use the default cypher?

> Please note that the server was a file- and VPN-server at the same time,
> and the client was a file- and VPN-client at the same time, so this is
> not a true VPN gateway test - such a test would have been much more
> complicated, requiring 4 systems and 3 switches. However, I believe the
> results are quite relevant even with my simple setup, I don't expect a
> VPN gateway test to provide very different numbers (perhaps in the
> vicinity of 10 ... 15%).

Would you expect the bandwidth per connection to remain constant as you 
add more connections up to the number of CPU cores?

   Les Mikesell

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