Thanks. Look forward to your results. Even though I also noticed that the
calculation looks similar on the surface, I did notice a comment in iperf3 to
the effect:
// XXX: This is NOT the way to calculate jitter
// J = |(R1 - S1) - (R0 - S0)| [/ number of packets, for average]
Any thoughts why that is in there? The calculation in the code appears to have
come directly out of the RFC 1889/3550.
Also, I want to clarify that this calculation seems to be average jitter not
instantaneous jitter.
Thanks.
-Jon
On Sep 2, 2014, at 4:23 PM, Bob (Robert) McMahon <rmcma...@broadcom.com> wrote:
> A quick cursory view of the source suggests the same calculation. Let me run
> both on my test rig and see if I get similar results.
>
> Bob
> -----Original Message-----
> From: Jon Lederman [mailto:jonleder...@gmail.com]
> Sent: Monday, September 01, 2014 5:22 PM
> To: iperf-users@lists.sourceforge.net
> Subject: [Iperf-users] Difference In Jitter Calculations Between IPerf2 and
> IPerf3
>
> Hi,
>
> In measuring jitter using Iperf 2.0.5 and Iperf 3, I have noticed a marked
> difference in the calculations up to an order of magnitude. Could you
> explain the differences in calculation of jitter between 2.0.5 and 3 and the
> accuracy. Which should I rely upon?
>
> Thanks in advance.
>
> Jon
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