[rrd-users] Re: suspicious interpolation

[Philippe Charnier]

Salut,

Tobias Oetiker <oetiker at ee.ethz.ch> wrote:

>rrdtool assumes a GAUGE value to remain the same from one update to
>the next.
>

by putting 1000000000:2 1000000009:2 1000000020:4, I have something like:

 4            |----------*  
              |          |
 2   *--------*          |       [pdp_new]
     | [18]   |   [44]   |       * data point 
  ---+---------+---------+--     + pdp_st
 ...00     ...10     ...20

(...00, ...10 and ...20 are the pdp_st of my example)

If the value remains the same until the next update, I would expect
the second pdp_new to be [11*2=22] and not [44] which takes the next
value (4) into account.  That will make a result of 2 for ...10, a
more correct value than 3.1.

If I enter ...20:4, I would expect ...20:4 when fetching the results
(i.e values entered at correct pdp_st should stay the same (in the
GAUGE case at least).

Have a nice day

------                                                            ------ 
Philippe Charnier          charnier@{xp11.frmug.org,free.fr,FreeBSD.org}

    ``a PC not running FreeBSD is like a venusian with no tentacles'' 
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