Sounds like smokeping:
http://oss.oetiker.ch/smokeping/


Alex




>________________________________
>From: Juliusz Chroboczek <jch@pps.jussieu.fr>
>To: bloat@lists.bufferbloat.net
>Sent: Tuesday, October 18, 2011 2:13 PM
>Subject: [Bloat] Plotting ping times in real time?
>
>Has anyone written a Linux program that plots ping times in real time?
>I.e. that gives the same information as running ping in an extra window
>(with no -c argument), but graphically?
>
>It would be helpful when manually tweaking an AQM.
>
>--jch
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