On 2019/09/26 11:16, Joerg Jung wrote: > 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
Maybe it's worth trying to track down further whether this is due to an NSD change or something else in the OS - cvs up -r OPENBSD_6_3 .. (be sure to use "make -f Makefile.bsd-wrapper [..]" when building).
