Maintained by: NLnet Labs

[Unbound-users] Cache Usage - Constant Hit Ratio

Maciej Soltysiak
Mon Jun 2 10:51:59 CEST 2014


Hello list!

Does anybody have any ideas about my constant cache hit ratio?
If it is of any help, here's my server section of unbound.conf for
inspection if anybody finds anything obvious.
It's a 512MB VM with 1 core.

server:
    do-not-query-localhost: no
    verbosity: 1
    do-ip6: yes
    prefetch: yes
    msg-cache-size: 24m
    rrset-cache-size: 24m
    key-cache-size: 24m
    infra-cache-numhosts: 40000
    num-threads: 1
    msg-cache-slabs: 1
    rrset-cache-slabs: 1
    infra-cache-slabs: 1
    key-cache-slabs: 1
    interface: 10.8.0.1
    interface: ::1
    interface: 127.0.0.1
#    statistics-interval: 0
    extended-statistics: yes
    statistics-cumulative: no
    access-control: 10.8.0.0/24 allow
    access-control: 127.0.0.1 allow
    access-control: A.B.C.D allow
    access-control: ::1 allow
    # The following line will configure unbound to perform cryptographic
    # DNSSEC validation using the root trust anchor.
    auto-trust-anchor-file: "/var/lib/unbound/root.key"

Best regards,
Maciej Soltysiak


On Thu, May 8, 2014 at 2:46 PM, Maciej Soltysiak <maciej at soltysiak.com> wrote:
> Hi,
>
> I am running Unbound as a recursive resolver. I monitor the cache hit
> ratio by dividing hits / total queries and I get a constant 41% while
> there is a varying activity on the server.
>
> I would expect the cache hit ratio vary in time and be more in the 80% mark.
> I am looking for help for suggestions on how to improve the cache hit ratio.
>
> Cache Hit Ratio Chart: http://dc1.soltysiak.com/chart2.php
> Cache Contents Chart: http://dc1.soltysiak.com/chart.php
>
> Does anybody have any ideas?
>
> Cheers,
> Maciej