traffic flow and interfaces:all

Good day. Could somebody explain, how work option “interfaces : all” in traffic flow settings? Currently got some problem: miktorik dont send traffic flow packets with this option, but if i change option “interfaces” to one of the clients vlan - all work. (Mikrotik CCR1009-8G-1S, v. 6.45.6, +flow-capture daemon on linux server).

Also there are about ~200 client vlans and summary traffic about 200M, is it possible that the problem is in hardware performance?