On Tue, Apr 29, 2025 at 04:32:01PM +0300, Kapetanakis Giannis wrote:
> Can it be related to this: dropped due to no socket?
IIRC OpenBSD does handle sending to a non-blocking socket in the
multi-threaded case very well. If multiple threads try to do that
simulteneously, some of them will get a EAGAIN. To test this
hypothesis, try running with a single thread and see if the errors
disappear.
-Otto
>
> # netstat -ss|grep -A7 ^udp
> udp:
> 819120 datagrams received
> 15494 with no checksum
> 22621 dropped due to no socket
> 170569 broadcast/multicast datagrams dropped due to no socket
> 625930 delivered
> 6497322 datagrams output
> 341480 missed PCB cache
>
> G
>
> On 29/04/2025 15:36, Kapetanakis Giannis wrote:
> > Hi,
> >
> > I'm having this busy router with multiple private networks behind which is
> > also doing dns caching services.
> > vlans and carp are also involved.
> >
> > I'm getting this almost every second on my logs from multiple/different
> > vlans and IPs (had it also on 7.6 as well on 7.7 now).
> >
> > Apr 29 15:11:49 unbound: [18412:1] notice: remote address is 10.14.0.196
> > port 44886
> > Apr 29 15:11:54 unbound: [18412:1] notice: sendto failed: Resource
> > temporarily unavailable
> >
> > tcpdump on this shows:
> > 15:11:49.420280 10.14.0.196.44886 > 10.14.0.1.domain: 13+ [2au] A?
> > google.com.(74) (DF) [tos 0xe0]
> > 15:11:52.519896 10.14.0.196.44886 > 10.14.0.1.domain: 13+ [2au] A?
> > google.com.(74) (DF) [tos 0xe0]
> > 15:11:52.520048 10.14.0.1.domain > 10.14.0.196.44886: 13 FormErr- 0/0/2(74)
> >
> > I believe I'm hitting some kind of limit either in the OS or in unbound.
> >
> > What I have and tested so far:
> > kern.maxfiles=32768
> >
> > login.conf:
> > unbound:\
> > :openfiles=32768:\
> > :tc=daemon:
> >
> > unbound.conf:
> > num-threads: 4
> > num-queries-per-thread: 4096
> > outgoing-range: 16384
> > so-rcvbuf: 2m
> > so-sndbuf: 2m
> >
> > no luck so far.
> >
> > pf states ~ 30K (hard limit 200K)
> > load 1.2 (mostly by pmacctd)
> > hw.machine=amd64
> > hw.model=Intel(R) Xeon(R) CPU X5660 @ 2.80GHz
> > hw.ncpu=6
> >
> > Any ideas?
> >
> > Thanks,
> >
> > G
> >
> >
> >
> >
>
