Re: FreeBSD 8.0 - network stack crashes?

Weldon S Godfrey 3 wrote:
> >> OK, at least we've figured out what is going wrong then.  As a
> >> workaround to get the machine to stay up longer, you should be able to
> >> set kern.ipc.nmbclusters=256000 in /boot/loader.conf -but hopefully we
> >> can resolve this soon.
> >>
> 
> I upped it to 256K.  What I am trying to wrap my head around is how it was 
> working somewhat for so long at 24K, but it got to near 65K before I 
> rebooted it with the higher setting.   Or did I reboot too early?  Is 
> there any cleanup that isn't triggered intil it reaches max nmbclusters? 
> I am trying to see if anything on our network has changed to cause this to 
> become cronic.

We have a ngaios server which handles up to 5000 concurrent nsca
daemons and connections which manifested a similar problem on a
Dell R905 (4x4core AMD, 16GB RAM, bce).

Setting the following in /boot/loader.conf sorted out the problem
for us:

kern.ipc.nmbclusters="131072"
kern.maxusers="1024"

mbuf usage is pretty static at:

$ netstat -m
40165/16220/56385 mbufs in use (current/cache/total)
40154/10500/50654/131072 mbuf clusters in use (current/cache/total/max)
40154/3359 mbuf+clusters out of packet secondary zone in use (current/cache)
0/1493/1493/65536 4k (page size) jumbo clusters in use (current/cache/total/max)
0/0/0/32768 9k jumbo clusters in use (current/cache/total/max)
0/0/0/16384 16k jumbo clusters in use (current/cache/total/max)
90349K/31027K/121376K bytes allocated to network (current/cache/total)
0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters)
0/0/0 requests for jumbo clusters denied (4k/9k/16k)
0/0/0 sfbufs in use (current/peak/max)
0 requests for sfbufs denied
0 requests for sfbufs delayed
246 requests for I/O initiated by sendfile
0 calls to protocol drain routines

Ian

--
Ian Freislich