Harris, Jeff wrote:
Does anyone know the effect of lowering the MULTI_CACHE_ROUTE_TTL
constant in multi.h from 60 seconds to say 10? Will it cause extra
network traffic or anything if the routes are purged more often?
I am trying to work around an issue I'm seeing with spikes in the number
of multi_instance objects. I have 125 connected clients and after a
number of restarts of all the clients, the number of multi_instance
objects on my server spikes to over 600 leading to an eventual
exhaustion of memory. I am using keep-alive settings of 5 second pings
and 30 seconds of inactivity.
Lowering the value to 30 seems to hold off the spikes for a bit. With a
value of 10 I have not seen the spikes.
Any help would be appreciated.
OpenVPN caches routes in a hash table for efficiency, so that it doesn't
need to iterate through the whole routing table in order to find a
match. The problem appears to be that cache entries may prolong the
life of a marked-for-delete multi-instance object by holding references
to it until the cache entry expires. So timing out the cached routes
earlier appears to be a good solution, and will not increase network
traffic.
James
