[Xorp-hackers] XORP IPC mechanism is stressed by data plane traffic

[edrt]

>
>Which version of FreeBSD are you running?
>

VxWorks, its networking stack might be FreeBSD like. 
Can't figure out what version it derived from.


>Can you grab the output of netstat -m when this happens (are you running
>out of packet headers, or clusters) ?
>

See below discussion.


>Is sysctl net.inet.tcp.do_tcpdrain enabled?
>

No. But I think it might cause stack to blindly drain XRL tcp connection.


>What is the tunable kern.ipc.nmbclusters set to?
>
>Can you provide any metrics about how much traffic you are dealing
>with (and how much of it is multicast) when this happens?
>

I choose a low end target board to stress. With 8kpps, 64byte packet
input, mbuf usage remains at about 1200/6600, 64byte mbuf cluster usage
remains at about 800/1000. In the test, no other traffic flow, only
testing multicast traffic.



Thanks
Eddy