[Unbound-users] Configuration suggestions?

[Anders Lindborg]

Thanks for your input!

This is an ISP setup, of course, designed to withstand just about anything we have had issues with in the past.

We have used PowerDNS a while ago and it was quite speedy, but I think Unbund outperforms just about anything. Could it perhaps be more efficient regarding cache management as well?
I have seen configurations in the thread with many gigabytes of cache, so how does it work for you all? 

Skickat från min iPhone

13 apr 2013 kl. 08:21 skrev "Daisuke HIGASHI" <daisuke.higashi at gmail.com>:

> Hi Anders,
> 
> Generally larger cache memory can improve latency (cache hit ratio)
> because it can keep more records in cache. I'm not certain whether too
> much memory introduce something harmful or not (except power
> consumption or failure rate of memory modules).
> 
> But according to my test, around 3-4GBs memory per one Unbound cache
> server seems to be enough (e.g. rrset-cache-size: 2g, msg-cache-size:
> 1g) even if in large ISP environment. More memory won't improve cache
> hit ratio meaningfully. PowerDNS recursor doc gives similar suggestion
> [1].
> 
> Note that Unbound will consume more memory than you specified due to
> malloc() overhead [2] and we will need more cache memory as
> DNSSEC-signed zone is deployed more widely.
> 
> [1] http://doc.powerdns.com/html/recursor-performance.html
>   "Cache hit rate does not improve meaningfully beyond 4 million
> max-cache-entries per thread…. "
> [2] http://www.unbound.net/documentation/howto_optimise.html
> 
> --
> Daisuke HIGASHI <daisuke.higashi at gmail.com>
>