Re: [Openvpn-users] Scalability?

[glynn taylor <gtaylor@xxxxxxxxxxxxxxx>]

Mario Gonzalez wrote:

> Hi,
>
> we are currently in the process of evaluating openvpn for use in one of our
> projects. The project would include the use of 10000+ clients. Openvpn docs
> state that it scales to 'hundreds or thousands of users', but what about further
> scalability? Does anyone have any experience with such a high number of clients?
> How would it impact the server-side? Is it possible to do?
>
>
> br
> mario;
>
>
>
>
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I have just started informal performance evaluations.  Encryption type 
and compression both add to the CPU load but I have not tested with more 
than 5 clients or over 6Mb/s yet.  Under these conditions using a P-III 
800 with 256AES and lzo on I could get OpenVPN's cpu use to about 24%, 
but that is a $40 CPU in a spare computer showing about 11% interrupts 
on TOP.  With no compression and Blowfish cpu was at 19-20%.  I am going 
to repeat the tests on a P4 with a couple of Gigabit cards.  Like I 
said, informal tests in the home lab over the weekend....  It may CPU 
bound, but too early to tell.  I have not looked deeply into what the 
box is actually spending time doing yet.

I am most interested in knowing how much memory each additional user 
requires at the server and if it will make use of encryption 
co-processors. 

I am guessing that, depending on the use patterns of the users, you 
should be able to support an arbitrarily large number of users because 
you can always scale horizontally by adding  more vpn servers and 
vertically by adding CPU, Network cards that offload the CPU.   Has 
anyone had a testing servers stress test this yet?

GT

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