Hi,
I run a few busy (~800 req/s) NSD servers which I upgraded
to 6.5, all stock/default OpenBSD, e.g. I’ve not tweaked any
sysctl values and nsd.conf matches the default as well, just
added a few hundred zones.
Now, when I increase servers from default 1 to 2 in nsd.conf:
server-count: 2
it starts spamming my log with:
nsd[62723]: sendto 1.2.3.4 failed: Resource temporarily unavailable
checking the source, server.c seems not to handle EAGAIN
after sendto() and does not recover or retry, it just increases
txerr statistic count - so answer seems really lost :(
I tried higher debug level, as well as increasing socket buffers to:
net.inet.udp.recvspace= 65536
net.inet.udp.sendspace=65636
but both didn’t help and netstat -s -p udp does show
0 dropped due to full socket buffers
anyways. So, I don’t believe this is a socket buffer issue.
The same server-count: 2 setting worked fine with 6.3.
Any hints, insights, or pointers?
Does anyone else experience the same?
Thanks,
Regards,
Joerg
