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Leap Second

Posted June 30, 2015 - permalink

There will be a leap second on June 30 at 23:59:60 UTC.  perfSONAR hosts with a default configuration should be unaffected, so this is primarily for informational purposes.

All perfSONAR hosts run NTP, which should correct for the leap second. If you are using an external time device (e.g. GPS, CDMA), consult your manual to figure out if any intervention is needed to add the leap second.  

If you’d like to learn more about the leap second and how it may affect hosts running flavors of RedHat (like the perfSONAR Toolkit does) , please see

perfSONAR Presentations at TNC 2015

Posted June 29, 2015 - permalink

perfSONAR was featured in several talks at the TNC 2015 workshop in Porto, Portugal.  Links to the sessions can be found here:

Debian Support for perfSONAR

Posted June 17, 2015 - permalink

The perfSONAR project now features a set of components for Debian Linux platforms.  The following operating systems have been tested:

  • Debian 7 Wheezy
  • Ubuntu 12 Precise

More information is available here:

Survey of Internet Performance Measurement Platforms

Posted May 21, 2015 - permalink

Vaibhav Bajpai of the Computer Networks and Distributed Systems (CNDS) Lab at Jacobs University Bremen in Germany prepared a survey of performance measurement platforms and standardization efforts.  The article's abstract is as follows:

A number of Internet measurement platforms have emerged in the last few years. These platforms have deployed thousands of probes at strategic locations within access and backbone networks and behind residential gateways. In this paper we provide a taxonomy of these measurement platforms on the basis of their deployment use-case. We describe these platforms in detail by exploring their coverage, scale, lifetime, deployed metrics and measurement tools, architecture and overall research impact. We conclude the survey by describing current standardization efforts to make large-scale performance measurement platforms interoperable.

This work can be found using the following links:

IEEE Library:
Mirrored Copy: