Re: [Sks-devel] Request for reporting of upstream bandwidth capacity

[Kristian Fiskerstrand]

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On 2012-05-16 20:22, Robert J. Hansen wrote:
> On 05/16/2012 01:12 PM, Kristian Fiskerstrand wrote:
>> As upstream bandwidth capacity is one of the considerations that
>> is taken into account in [0] I would appreciate if the server
>> operators that have not already done so would kindly email me
>> this information off list (My UIDs in 0x6b0b9508 can be used for
>> this).
> 
> This is sort of a black art.  Depending on which online service is 
> providing the test, I've seen my upload and download speeds vary by
> more than two orders of magnitude.  Further, since pretty much all
> cable ISPs were at one point in league with the Devil before
> finally usurping Lucifer's throne, I can't even rely on the vague
> promises made by their tech support imps and balseraphs.
> 
> This isn't to say there's no point in what you're doing -- I think 
> there's a lot of merit to it! -- but if we all use a different
> service we're going to introduce an awful lot of statistical noise.
> Is there any particular bandwidth capacity test that you would
> prefer we use?
> 

Hi Robert,

No, I don't have a particular test in mind. As you say, it might
introduce some noise. I can however, to some extent, control this by
the loading given to this particular parameter ($\beta_B$), but the
more data I get - the more I can play around with this for the actual
SRV weights.

Currently the $\beta_B$ is set to 450, and I have total upstream
recorded at about 4500, so a 100 Mbit/s connection only add 10 to the
total weight. This is linear, so a Gbit connection would add 100 to
the weight. This compare to the $\alpha$ (the base weight) of 150 for
all servers.

Most of the SRV weight is however determined by the responsetime
measured from various clients ($\beta_R$....)

- -- 
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Kristian Fiskerstrand
http://www.sumptuouscapital.com
Twitter: @krifisk
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Corruptissima re publica plurimæ leges
The greater the degeneration of the republic, the more of its laws
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