[SR-Users] using pipelimit at CPS (1 second)

Vik Killa vipkilla at gmail.com
Thu Jan 7 20:00:49 CET 2016

Do you operate Kamilio in a wholesale environment with many CPS?

On Thu, Jan 7, 2016 at 12:22 PM, Alex Balashov <abalashov at evaristesys.com>

> Vik,
> We have used pipelimit at a sampling interval of 1 second, and, on the
> basis of contact with reality, decided to shift to a 3-second sampling
> window.
> The major problem with the 1-second interval is not the CPU usage, but
> that it's not very useful. Such a sampling window is extremely responsive
> to fluctuations within a short time, and this manifests very well in SIPP
> testing.
> However, SIPP generates calls in an orderly and linear fashion. Real-world
> SIP traffic is highly bursty and volatile. The result is that a 1-second
> sampling window will not properly encapsulate the data so as to reliably
> enforce a CPS limit of X. For example, if you set a limit of 300 CPS, the
> short sampling window makes it quite possible to burst far beyond 300 CPS
> as long as it is done within < 50% of the duty cycle.
> 3 seconds is a more realistic compromise. In virtue of smoothing some
> peaks, it is less dynamic and responsive, but it far more accurately takes
> into account the bursty and chaotic nature of real-world high-volume call
> setups. These are not modeled well with SIPP testing.
> -- Alex
> --
> Alex Balashov | Principal | Evariste Systems LLC
> 303 Perimeter Center North, Suite 300
> Atlanta, GA 30346
> United States
> Tel: +1-800-250-5920 (toll-free) / +1-678-954-0671 (direct)
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
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