[strongSwan] strongswan poor performance

[Noel Kuntze]

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Hello Miroslav,

The processing of the traffic takes place in kernel threads, not in the daemon.
To properly look at the load of ipsec, you have to look at the CPU usage of the system threads.
IPsec in kernel space isn't parallelized at all. If you want panellized processing of ESP and AH packets in kernel space,
you should look at [1] and ask Martin Willi or Tobias Brunner about this topic.

[1] http://www.strongswan.org/docs/Steffen_Klassert_Parallelizing_IPsec.pdf

Regards,
Noel Kuntze
 
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Am 28.07.2014 um 15:50 schrieb Miroslav Kubiczek:
> Hi,
>
> I’m trying to figure out what’s the bottleneck of on strongswan machine with this network setup:
>
> I have:
> * several VPN clients (using vpnc https://www.unix-ag.uni-kl.de/~massar/vpnc/ - trying to simulate an iPhone)
> * one lighthttp server.
> * one strongswan gateway with this options:
>
> …
>       i_dont_care_about_security_and_use_aggressive_mode_psk=yes
> …
> conn ios
>       keyexchange=ikev1
>       authby=xauthpsk
>       xauth=server
>       aggressive = yes
>       left=10.30.10.213
>       leftsubnet=0.0.0.0/0
>       right=%any
>       rightsourceip=10.30.11.120/29
>       rightdns=208.67.220.220
>       auto=add
>       type=tunnel
>       rekey=no
>
>
> When I fire HTTP requests (using a perf test tool) I get just 100 msg/s whereas without VPN it goes up to 6.000 msg/s.
> Network traffic on strongswan is just on 800k/s on UDP 4500 no matter of how many clients I use.
> TOP doesn’t show any process to go above 10%. Increasing number of CPUs also doesn’t help.
>
> Can anybody give me a clue of how to find the bottleneck?
>
>
> Thanks,
> Miro
>
>
>
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