# [smokeping-users] Get packet loss data in last ten days graph

Alessandro Palermo ok.aless at gmail.com
Tue Apr 23 21:02:15 CEST 2013

```Thank you. I understood perfectly

On 23 April 2013 15:43, Russell Dwarshuis <rjd at merit.edu> wrote:

> No, you have 1 packet loss.  It is recorded as:
>
> 1366720500: -nan 9,3666666667e-01
> 1366720800: -nan 6,3333333333e-02
>
> That is, 0.937 of a packet and, 5 minutes later, 0.033 of a packet.  That
> is why
> maximum packet loss is 0.937/20 = 4.68% instead of 5%
>
> It does this because the packet loss measurement occurred at roughly
> 1366720520 and the
> measurement is interpolated.  Actually I think it is a little more
> complicated
> that that, but that is the basic concept.  This Works great when you are
> not
> worried about perfect precision, but not so great when you are trying to
> measure integers!
>
>
> -Russell Dwarshuis
>
> ----- Original Message -----
> From: "Alessandro Palermo" <ok.aless at gmail.com>
> To: "Russell Dwarshuis" <rjd at merit.edu>
> Cc: "smokeping-users" <smokeping-users at lists.oetiker.ch>
> Sent: Tuesday, April 23, 2013 1:58:56 PM
> Subject: Re: [smokeping-users] Get packet loss data in last ten days graph
>
>
> I still got a doubt about the calculataion of packet loss.
> For example I've got 2 losses in the last 3 hours in two consecutives
> polling cycles (1/20 and 1/20).
> The data in the graphs shows pl= 0.14% avg and 4.68% max
> In the rrd data I've got:
>
> rrdtool fetch myrrdfile.rrd AVERAGE -s -3h -e now | cut -f 1-3 -d' '
>
>
> 1366717200: -nan 0,0000000000e+00
> 1366717500: -nan 0,0000000000e+00
> 1366717800: -nan 0,0000000000e+00
> 1366718100: -nan 0,0000000000e+00
> 1366718400: -nan 0,0000000000e+00
> 1366718700: -nan 0,0000000000e+00
> 1366719000: -nan 0,0000000000e+00
> 1366719300: -nan 0,0000000000e+00
> 1366719600: -nan 0,0000000000e+00
> 1366719900: -nan 0,0000000000e+00
> 1366720200: -nan 0,0000000000e+00
> 1366720500: -nan 9,3666666667e-01
> 1366720800: -nan 6,3333333333e-02
> 1366721100: -nan 0,0000000000e+00
> 1366721400: -nan 0,0000000000e+00
> 1366721700: -nan 0,0000000000e+00
> 1366722000: -nan 0,0000000000e+00
> 1366722300: -nan 0,0000000000e+00
> 1366722600: -nan 0,0000000000e+00
> 1366722900: -nan 0,0000000000e+00
> 1366723200: -nan 0,0000000000e+00
> 1366723500: -nan 0,0000000000e+00
> 1366723800: -nan 0,0000000000e+00
> 1366724100: -nan 0,0000000000e+00
> 1366724400: -nan 0,0000000000e+00
> 1366724700: -nan 0,0000000000e+00
> 1366725000: -nan 0,0000000000e+00
> 1366725300: -nan 0,0000000000e+00
> 1366725600: -nan 0,0000000000e+00
> 1366725900: -nan 0,0000000000e+00
> 1366726200: -nan 0,0000000000e+00
> 1366726500: -nan 0,0000000000e+00
> 1366726800: -nan 0,0000000000e+00
> 1366727100: -nan 0,0000000000e+00
> 1366727400: -nan 0,0000000000e+00
> 1366727700: -nan 0,0000000000e+00
> 1366728000: -nan -nan
>
> And I can't understand how to obtain the value of pl=0.14% avg. I thought
> that the data stored in the rrd was the number of packet loss in a round or
> the average each 5 minutes.
> In the first case I get a value of pl=(number of packet losses in last
> 3hours/total packets sends)2/720=0.0028, then pl=0.28%.
> Surely I'm wrong in something.
>
> Thanks
>
>
>
>
> On 22 April 2013 21:32, Alessandro Palermo < ok.aless at gmail.com > wrote:
>
>
>
>
> Thanks very much Russell. I will try this.
>
> Regards
> El 22/04/2013 15:36, "Russell Dwarshuis" < rjd at merit.edu > escribió:
>
>
>
>
> Here is an example (I piped it through cut so you don't have to see all 20
> ping times):
> rrdtool fetch your.rrd AVERAGE -s -20minutes -e now | cut -f 1-3 -d' '
>
>
> 1366654200: nan 0.0000000000e+00 5.7700000000e-03 5.7600000000e-03
> 1366654500: nan 0.0000000000e+00 5.7700000000e-03 5.7600000000e-03
> 1366654800: nan 0.0000000000e+00 5.7700000000e-03 5.7600000000e-03
> 1366655100: nan 0.0000000000e+00 5.7714666667e-03 5.7600000000e-03
>
> Loss is in column 3 (0.0000000000e+00)
>
>
>
> -Russell Dwarshuis
>
> ----- Original Message -----
> From: "Alessandro Palermo" < ok.aless at gmail.com >
> To: smokeping-users at lists.oetiker.ch
> Sent: Monday, April 22, 2013 10:42:46 AM
> Subject: [smokeping-users] Get packet loss data in last ten days graph
>
>
>
>
>
> Hi list.
> I'm monitoring around 300 wan links with fping probe with no problem. I
> the lasts median rtt in a gauges view and a link to show the information
> about the route of each wan links and record the changes in the routes.
> Now I want to create a report to monitoring the packet loss in the last
> ten day and send a mail with the graph of the links that have a packet loss
> greater than 5% per example.
> How can i get this value for the .rrd files? I've been inspected the rrd
> files but I just see the last loss value.
>
>
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>
>
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