[strongSwan-dev] StrongSwan 5.6.3, Netlink performance issue as responder.

Tobias Brunner tobias at strongswan.org
Tue Dec 4 16:33:58 CET 2018

Hi Vinay,

> Are you talking about the below parameters


> Is the Limit 8 for the policy table set in kernel?


> What are the best values for the Hash to get to at least 100K tunnels at
>  200tunnels/sec.

It doesn't depend on the number of SAs, but the negotiated traffic
selectors and what parts of the addresses you want the kernel to hash.
It will do so if the network prefixes configured in a policy's selector
(src/dst) are *both* equal or larger than the respective thresholds.
So with the IPv4 example you gave, only policies that have a local net
mask (src for OUT policies, dst for IN/FWD policies) between /16 and /32
*and* a remote net mask of exactly /32 will be hashed.  All others are
stored in the overflow list.

> And other kernel buffer parameters needs to be set from below list?

I don't think so.


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