On 2019/09/26 13:45, Stuart Henderson wrote:
> 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).
>
Or, following a comment from claudio@, try a kernel built with this:
Index: syscalls.master
===================================================================
RCS file: /cvs/src/sys/kern/syscalls.master,v
retrieving revision 1.189
diff -u -p -r1.189 syscalls.master
--- syscalls.master 11 Jan 2019 18:46:30 -0000 1.189
+++ syscalls.master 26 Sep 2019 13:01:46 -0000
@@ -261,7 +261,7 @@
130 OBSOL oftruncate
131 STD { int sys_flock(int fd, int how); }
132 STD { int sys_mkfifo(const char *path, mode_t mode); }
-133 STD NOLOCK { ssize_t sys_sendto(int s, const void *buf, \
+133 STD { ssize_t sys_sendto(int s, const void *buf, \
size_t len, int flags, const struct sockaddr *to, \
socklen_t tolen); }
134 STD { int sys_shutdown(int s, int how); }
Run "make syscalls" in sys/kern before building.
