quagga ospfd not happy, suspecting kernel tuning

[peter eisch <peterbokunet%hotmail.com@localhost>]

I'm getting these in my syslog:
Feb 27 11:28:20 mouse ospfd[22629]: *** sendmsg in ospf_write failed to
<localip>, id 0, off 0, len 68, interface vlan511, mtu 1500: No buffer space
availableFeb 27 11:28:20 mouse ospfd[22629]: *** sendmsg in ospf_write failed
to 224.0.0.6, id 0, off 0, len 1036, interface vlan511, mtu 1500: No buffer
space availableFeb 27 11:28:20 mouse ospfd[22629]: *** sendmsg in ospf_write
failed to 224.0.0.6, id 0, off 0, len 112, interface vlan511, mtu 1500: No
buffer space available
What can I do to my i386/NetBSD-5.0 to get it happy?  It logs that every
couple minutes.  Some of the LS updated go out, but other ones like this
don't.  The kernel isn't logging anything (for better or worse).  Beyond the
generic config, I already have:
_CFG_options IPSTATE_SIZE=92111_CFG_options IPSTATE_MAX=64433_CFG_options
NAT_SIZE=2047_CFG_options RDR_SIZE=2047_CFG_options
HOSTMAP_SIZE=8191_CFG_options NAT_TABLE_MAX=180000_CFG_options
NAT_TABLE_SZ=16383_CFG_options IFQ_MAXLEN=1024
The system has 2G of RAM and uses a nominal 120M with few other user
processes.  I'm happy to get the kernel more RAM -- what's the right way to do
this?
peter