here I am using a CRS125-24G-1S with the last stable version (6.40.4) and also tested with the 6.41rc47, without rules like a simple switch between all the ports passing in average 150MBPS and also I am having packet loss
I don't know what conclusion you've drawn from this 2 year old forum thread
, don't revive old threads like this.
Have you searched the forum about your problem? A CRS125 is perfectly capable of switching multiple Gigabit when correctly configured. When routing/bridging 150Mbit is close to the max it can do, depending on the rules used. Are you certain you are ONLY using the switching (Master/Slave ports) and not running it through a bridge or routing it somehow?
There also used to be a problem with the CRS125 where the ports needed to be changed from hardware only to ethernet-default to perform correctly.