Re: [Sks-devel] sks-keyservers.net: Calculation of SRV weights

[Kristian Fiskerstrand]

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On 07.05.2012 19:49, Kristian Fiskerstrand wrote:
> On 06.05.2012 01:01, Kristian Fiskerstrand wrote:
>> Hi,
> 
>> I've been playing around with some thoughts on how to improve the
>>  calculation of DNS Service Record (SRV) weights lately[0]. I 
>> would, however, like to make use of the experience of others in 
>> continuing this process.
> 
> 
> I have then implemented[1, 2] a working prototype of an updated 
> version of [0] taking into account response-times as measured from
> 3 different locations in Europe (I welcome more, if anyone is up
> for running a measuring client[3, 4]).
> 

Woops, seems I was a bit too quick there. Fixed a bug[0] as the pow()
function didn't contain the full expression.

But now I got another fun result where, with a responsetime of
    [keyserver.rainydayz.org] => 1.6733216892119

The SRV weight become
    [keyserver.rainydayz.org] => 431604

As the 2-pass R distribution is
Array
(
    [stddev] => 1.3050507831397
    [var] => 1.7031575465735
    [mean] => 4.2681999895094
    [count] => 76
)

Hence
        
R       1.673321689
mu      4.26819999
sigma   1.305050783
        

=H19/((H20-(H21-2*H22))^2)
R_weight        431,503

Granted this server should have a high weight for that, but not THAT
high.

I can probably counter this by adjusting \phi (the error value for
servers that are not responding properly during the measurement run,
as that is skewing the results rightmost)

[0] http://code.google.com/p/sks-keyservers-pool/source/detail?r=111
- -- 
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Kristian Fiskerstrand
http://www.sumptuouscapital.com
Twitter: @krifisk
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