Stephen Clark wrote:
Hello List,
I know 4.9 is ancient history, but unfortunately we have several
thousand sites installed. We are in the process of moving to 6.1 when it
is released.
Right now I have an immediate problem where we are going to install two
system at a
HQ site. Each of the 2 systems will have two gre/vpn/ospf tunnels to a
100 remote sites in the
field. The broadband will be a T3 with failover to dialup actiontec
dualpc modems. We want
to use FreeBSD systems rather than put in Cisco equip which is what we
have done for other
large customers.
The problem:
I have been testing between an Athlon 64 3000+ (client) and an Athlon
64 X2 4800+ (server) across a dedicated 100mb lan. When I use nttcp,
which is a round trip tcp test, across the gre/vpn the client system,
(which goes to 0 percent idle), network stack will eventually stop
responding. In trying to track this down I find that
net.inet.ip.intr_queue_maxlen which is normally 50 has been reached (I
added a sysctl to be able to look at it), but it never drains down. If I
increase it things start working again. If I continue to hammer the
client I see the
intr_queue_maxlen continue to grow until it again reaches the new
maximum. Another datapoint if I don't send the data thru the gre tunnel,
but only thru the vpn I don't see this problem.
I've looked at the gre code til I am blue in the face and can't see
where mbufs were not being freed when the quelen is full.
If anybody could give some direction as where to look or how to better
trouble shoot this problem it would be greatly appreciated.
Thanks for being such a great list,
Steve
I have discovered that if I disable quaqqa/ospfd then I don't lose
mbufs! This makes it appear
that the mbuf leak is in the multicast routing logic. In fact I lose
mbufs even with the both system basically idle but with a 100 vpn/gre
with multicast going on thru the gre then the vpn.
Any ideas on where to focus my continued investigation?
Thanks to everybody who has responded.
Steve
--
"They that give up essential liberty to obtain temporary safety,
deserve neither liberty nor safety." (Ben Franklin)
"The course of history shows that as a government grows, liberty
decreases." (Thomas Jefferson)
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