[Pdns-dev] Negative Caching

[Patrick Domack]

Quoting Peter van Dijk <peter.van.dijk at netherlabs.nl>:

> Hello Patrick,
>
> On Nov 2, 2012, at 17:10 , Patrick Domack wrote:
>
>> I have been adjusting the source to increase the negative cache  
>> size, for when quering against rbl's
>>
>> From my stats, it seems to me that the negative cache is not part  
>> of the positive cache, but totally different cache area/counters.
>>
>> So it seems the real max-cache-size = max-cache-size * 110% (as the  
>> negative cache is hard coded at 10% of the max-cache-size currently).
>>
>> I adjusted my source, so I could specify the negative cache size as  
>> a percentage of the max-cache-size, but as it seems to be  
>> different, I'm wondering if my patch (before I submit it in a  
>> feature request) should be changed to a negative-cache-size, that  
>> would just default to the current behavure.
>
>
> Concrete numbers are usually better than percentages of other numbers.
>
> In any case, please submit your patch at wiki.powerdns.com so people  
> can look at it!
>

I'll submit it sometime next week, I've been playing with it, and  
seeing how it works, it does seem to be seperate from stats point of  
view, and I had decided next time I look at it, to change it from  
percent to just a raw number, and just leave the default as a percent  
if undefined, so there isn't any suprises on an upgrade.