response-rate-limiting - "window" explained?

[Bob Harold]

On Tue, Jan 9, 2018 at 11:11 AM, Tony Finch <dot at dotat.at> wrote:

> Tom <tomtux007 at gmail.com> wrote:
> >
> > Slip is set to "0" (always drop). After stopping the flood, I'm
> immediately
> > able to query the same record (www.example.com) with a positive answer.
> Does
> > the "window 5;" or "window 30;" or "window 3600;" possibly has no effect?
>
> The script below works for me. My server is configured with
>
>         responses-per-second 2;
>         slip 0;
>
> The script "floods" at 10 qps for 15 seconds (enough to fill the window),
> then drops to 1qps and times how long it takes to recover. At the end it
> says the recovery time was 20 seconds. This is a bit more than the window
> size because I wasn't completely quiet during the recovery time.
>
> ################################################################
>
> #!/bin/sh
>
> set -eu
>
> dig='dig +ignore +tries=1 +timeout=1 +norec dotat.at @grey.dotat.at'
>
> start=$(date +%s)
>
> while [ $(date +%s) -lt $(($start + 15)) ]
> do
>         $dig | grep aa &
>         sleep 0.1
> done
>
> end=$(date +%s)
>
> while ! $dig | grep aa
> do
>         :;
> done
>
> echo $(( $(date +%s) - $end ))
>
> ################################################################
>
> Tony.
> --
> f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/  -  I xn--zr8h
> punycode
> Irish Sea: Southeast 5 to 7, becoming cyclonic 4 or 5 later. Moderate or
> rough, becoming slight or moderate. Occasional rain. Good, occasionally
> poor.
>

Tony,
   That's a good test, with the default window of 15 seconds, but could you
please repeat it with a window like 120, and see if it changes
accordingly?  Tom's testing indicates that the 'window' parameter has no
effect, which seems wrong.

-- 
Bob Harold
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