> On 26. Sep 2019, at 15:02, Stuart Henderson <[email protected]> wrote:
> 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:
FYI, I tried that diff and a few other things but neither did help.
> 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.
