unbound performance

[Michel Blais]

Hi,

I'm trying to make unbound have less timeout query (I see around1 to 2%
of query timeout using DNS performance test from Silverwolf Software
and was looking at "Unbound : Howto optimise"
and wanted to try the so-rcvbuf option but enabling it cause a error on
service start.

On BSD change |kern.ipc.maxsockbuf| in |/etc/sysctl.conf|. On OpenBSD change
header and recompile kernel.
Source : http://www.unbound.net/documentation/howto_optimise.html

Also :
Actually, I've solved the problem. In "src/sys/sys/socketvar.h", change

from
===========================================
/*#define SB_MAX (256*1024)*/ /* default for max chars in sockbuf */
===========================================

to
==========================================
#define SB_MAX (2096*1024) /* default for max chars in sockbuf */
==========================================

Then recompile the kernel and I can set the buffer size up to 2MBs.
Source : http://fixunix.com/bsd/87796-how-raise-maxsockbuf-openbsd.html


Is this a good idea to change this value ? Any reason why it limited 
like this ?
Is there any other way to change max chars in buffer size than recompile
the kernel.

OpenBSD 5.1 amd64

---------- Unbound.conf ---------------

server:
     verbosity: 1
     logfile: /var/unbound/var/log/unbound.log

     interface: 0.0.0.0
     port: 53
     do-ip4: yes
     do-ip6: no
     do-udp: yes
     do-tcp: yes

     access-control: 0.0.0.0/0 allow_snoop
     hide-version: yes
     harden-glue: yes

     cache-min-ttl: 3600
     cache-max-ttl: 86400

     prefetch: yes

     num-threads: 4
     outgoing-range: 8192
     num-queries-per-thread: 2048
     msg-cache-slabs: 8
     rrset-cache-slabs: 8
     infra-cache-slabs: 8
     key-cache-slabs: 8

     rrset-cache-size: 256m
     msg-cache-size: 128m

   # so-rcvbuf: 8m <-value I want to activate

     unwanted-reply-threshold: 10000
     do-not-query-localhost: no
     val-clean-additional: yes

    forward-zone:
          name: "."
          forward-addr: 8.8.8.8          # Google Public DNS
          forward-addr: 8.8.4.4          # Google Public DNS

    stub-zone:
         name: "ourdomain.com"
         stub-addr: 127.0.0.1@nsdport

    stub-zone:
         name: "X.Y.Z.in-addr.arpa"
         stub-addr: 127.0.0.1@nsdport

    stub-zone:
         name: "W.Y.Z.in-addr.arpa"
         stub-addr: 127.0.0.1@nsdport

---------- end of config file -----------------------

Thanks

Michel