On 2012-07-13, Limaunion <limaun...@fibertel.com.ar> wrote:
> hi all! I'm running unbound as a caching resolver in an ALIX box running 
> OpenBSD 5.1.
>
> For some reason I'm getting many of these kind of errors:
>
> Jul 13 10:56:29 pfire unbound: [11449:0] notice: sendto failed: No 
> buffer space available
> Jul 13 10:56:29 pfire unbound: [11449:0] notice: remote address is 
> 8.8.8.8 port 53
> Jul 13 10:56:29 pfire unbound: [11449:0] notice: sendto failed: No 
> buffer space available
> Jul 13 10:56:29 pfire unbound: [11449:0] notice: remote address is 
> 8.8.8.8 port 53

On a busy nameserver you may need to increase sysctl values:
net.inet.udp.recvspace and net.inet.udp.sendspace.

Also if you're using altq you may be running into the qlimit.

If you're using prefetch in unbound (it's not enabled by default),
you might want to try disabling this, it can speed some things up but
can also add a bunch of extra traffic which you don't want if you're
bumping into limits.

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