80MB with 1TCP Connection, 200Mb with 20 TCP Connections....only Ethernet

RouterOS General
1

Hello,

we have a Link

RB1000—CRS—MT-MediaConverter—10kmFiber—CRS----Alcoma6km----CRS----Alcoma4km—CCR

All Links are Gigabit Full-Duplex.

When i made an Bandwith-Test with max. 1 TCP Connetion from RB1000 to CCR, then only 80Mbit/s was reached, with 20 Connections are 200 Mbit/s reached.
Why?
What can be the Problem?
Alcoma-Links are licensed Links. There are working on 320 Mbit/s (radio).
The CRS hat 6.30.2 installed. The Ethernet-Ports are all configured as an slave Port from the other (no bridge).


best regards
Christian

2

Do not use bandwidth-test, for CCR testing it is limited to 1 CPU core -
use trafficgenerator:
http://wiki.mikrotik.com/wiki/Manual:Performance_Testing_with_Traffic_Generator

or iperf3 http://software.es.net/iperf/

3

ok. this is clearify. but why are more traffic with more connections?
Should it than not be more ore same traffic with one?

4

This is how TCP works with parallel streams.

5

Hello kristaps,

when i make an LAN Cable direkt connection between 2 RB1200 , then BW-Test with 20 TC Connections are ~250Mbit/s, with 1 (one) Connection TCP are same (250 MBit/s).

Please tell me, where there is an TCP Paralell-Stream - Problem ?

with or without routing is wurscht !


best regards
Christian