[Ntop] What is the minimum added latency from inline Ntopng Edge?

Victor Hooi

2018-08-17 09:29:46 UTC

Hi Alfredo,

That is very helpful.

We are looking at virtualising Ntopng Edge using KVM on a test Dell server
with Intel E5-2640(2.50 Ghz, 6-core) and 96GB of RAM.

Question 1 - I assume your 600Mhz test was bare-metal, correct?

Question 2 - Would we be looking at numbers quite similar to this? (I
assume there is some kind of ceiling for performance).

Question 3 - Which upgrade would have the biggest improvement on latency?
(e.g. more cores, faster clock-speed, faster SSDs, more RAM etc.)

Question 4 - Are there any caveats with virtualising Ntopng Edge with KVM?
Is this expected to affect performance, and if so, any guidelines to
mitigate it?

Question 5 - How can we measure our own latency? Does Ntopng Edge have some
kind of diagnostics mode, or debug page which presents this data?

Thanks,
Victor

Hi Victor
on a low-end embedded system (600Mhz) we measured an avg
added latency of ~0.15 msec, and a max of ~1.75 msec, with
respect to a clean linux bridge.
Regards
Alfredo

Post by Victor Hooi
Hi,
I'm curious what sort of added latency we can expect an inline Ntopng

Edge server?

Post by Victor Hooi
Assuming that the machine is reasonably well spec-ed - e.g. 16GB of RAM

(or more), 4 or more cores (I assume Ntopng Edge is multithreaded, right?),
modern SSDs - is there some baseline figure (or range) in milliseconds that
it will always add, no matter what?

Post by Victor Hooi
(Either from Ntop testing, or perhaps people's experience in the fields)
Regards,
Victor
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