perfSONAR User Q&A and Other Discussion

[Pedro Queirós <>]

Hi there,

we're using OWAMP to measure the link between two sites we have,

using two dedicated machines.

In another two machines we have a proprietary solution to do the same

task.

We're finding that the average results are nearly identical, but when

using OWAMP, the max delay that's show in the graph has several

spikes that are not displayed when using the proprietary solution. In

fact, the proprietary solution only shows max delays values close to

the average, that is, around 3~4 ms.

I was wondering if anyone has had the chance to run OWAMP side by

side with other similar tools and compare the results. We can't find any

reason why those spikes appear in the graphs in OWAMP.

They also appear more frequently in IPv4 measurements vs IPv6

measurements.

I'll attach screenshots so you can hopefully understand better what I

mean. As you can see, in IPv6, the spikes are much more rare.

I'm hoping to find a reason for these spikes, because nothing else

(CPU load, network congestion) justifies these spikes in the 

measurements - and they don't appear in the measurements we have

in place using a proprietary solution.

Kind Regards,

Pedro Queirós

Attachment: ipv4_backward_max.png
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Attachment: ipv4_forward_max.png
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Attachment: ipv4_min.png
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Attachment: ipv6_backward_max.png
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Attachment: ipv6_forward_max.png
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Attachment: ipv6_min.png
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