High CPU Load on RB433 and R52N

RouterOS Wireless Networking
1

Hello,

I have noticed that with ROS 4.x (tested on 4.6 to 4.10) my RB433 and R52N cards hog the CPU?
Is this normal with TP-Link adapter it doesn’t happen?.

If I have 3 radios in RB433 the CPU load goes up to 50-70%?
If I disable radio it goes down below 10%.

Here Are the Settings:
0 name=“wlan1” mtu=1500 mac-address=00:0C:42:61:BB:16 arp=enabled
interface-type=Atheros 11N mode=ap-bridge ssid=“xxx”
frequency=2417 band=2.4ghz-onlyg scan-list=default wds-mode=disabled
wds-default-bridge=none wds-ignore-ssid=no default-authentication=yes
default-forwarding=yes default-ap-tx-limit=0 default-client-tx-limit=0
hide-ssid=no security-profile=default compression=no

1 name=“wlan2” mtu=1500 mac-address=00:0C:42:61:BA:10 arp=enabled
interface-type=Atheros 11N mode=ap-bridge ssid=“xxx2”
frequency=2447 band=2.4ghz-onlyg scan-list=default wds-mode=disabled
wds-default-bridge=none wds-ignore-ssid=no default-authentication=yes
default-forwarding=yes default-ap-tx-limit=0 default-client-tx-limit=0
hide-ssid=no security-profile=default compression=no

2 R name=“wlan3” mtu=1500 mac-address=00:0C:42:61:BB:19 arp=enabled
interface-type=Atheros 11N mode=ap-bridge ssid=“xxx3”
frequency=2452 band=2.4ghz-onlyg scan-list=default wds-mode=disabled
wds-default-bridge=none wds-ignore-ssid=no default-authentication=yes
default-forwarding=yes default-ap-tx-limit=0 default-client-tx-limit=0
hide-ssid=no security-profile=default compression=no

2

Usually nstreme consumes a lot of cpu. Also cpu usage proportionally grows according to amount of passing traffic.

3

As you can see there is no Nstreme just plain G standard.
Radio’s are used in Bridge mode for Hotspot…

It does not matter if the clients are connected to wlan interface or not.. the CPU load when WLAn interface is enables jump!

I think it is some kind of a driver problem.. Maybe…

Mikrotik Staff any suggestions?

4

It may not apply to you, but I found my high cpu usage came from having DFS set to no radar detect while having a scanlist set to “2412,2437,2462”. If I disabled the scanlist the usage fropped right down to 1% (No clients attached). Perhaps there are some settings causing it, have you tried turning an option off at a time to see if there’s one that is causing the issue? We’re using RB600As with 2xR52N cards installed, running ROS 4.10 and bootloader 2.17

My idea of using the scanlist and DFS was to limit the channels it would auto-select but the high usage was an issue.