RouterBoard 333 - High CPU load

Hardware MikroTik hardware general
1

I’m running RouterOS 3.7 on a Routerboard 333 with 3x R52.
And my CPU load jump from 70% to 100% (about an average of 50% on graph)

I’ve try’d to reboot alot of times, but it just jumps to a 100% again after it reboots.
But when i disable wlan2 i falls for a bit, then after some time it’s a 80% again.
And there is no trafic!

Installed packages:
Advanced-tools
dhcp
ppp
routerboard
security
system
wireless

Setup:
wlan1 - as 2,4GHz b/g - ap bridge
wlan2 - as 2,4GHz b/g - ap bridge
wlan3 - as 2,4GHz b/g - station

bridge1 = ether1 + wlan2 + wlan3

IP:
wlan1 = 10.1.0.1/8
DHCP client1 = bridge1

DHCP server on wlan1 serving from: 10.255.255.1 to: 10.255.255.250


What can be the problem?

(RouterOS really needs a task manager of some sort)


/Ken

2

please make a supout.rif file and send to support with this information also

3

Hi

Iam also experiencing strange CPU load when there isnt any traffic going through the RB333. The CPU load is 0% to 5% for 3 minutes, and then it will goes up to 20%-70% for the next 60 seconds, then down again to 0%-5%. Iam monitoring the cpu load via sshl.
The MRTG CPU load graph shows max 30% and average 15%.
I dont know what is causing this strange cycle. Upgrading bios to 2.14 (From 2.10) does not help. ROS upgrade to 3.7 does not help either.


My setup is as follows :
-simple bridge between ether1 and 3 Wireless card(2 R52H, 1 CM9)
-one private IP assigned to the bridge

  • no wireless client.
  • wireless card all set to 0 tx power.

Package:
Advanced-tools
routerboard
security
system
wireless

Please help. I need to put this RB into production soon.

4

Solved my problem. I changed both R52H cards to B-only mode, and cpu load never goes beyond 3%. Anyone care to explain why ?

5

I had 2x AP bridged at 2,4ghz B/G and 1x station 2,4GHz B/G but when i changed on of the AP’s to 5GHz i CPU load did fall from 70% to 5%

6

In my case, I discovered that it is also one of the R52H that’s causing the high CPU load. Whenever that offending R52H is in B/G or G-only mode, CPU load problem will appear. I have never tested it with 5ghz, but I know switching to B-only mode or using 5mhz channel width will solve the problem.
I doubt it is a card problem, since Qpox and I are using 2 different cards. Will someone from MT comment on this please ?

7

please set the wireless cards setting ‘adaptive-noise-immunity’ to ‘no’

8

Yep, that’s it. Problem gone, set adaptive-noise-immunity to ‘No’ and cpu load at 0% most of the time,even at B/G mode. Wasn’t aware of this new setting. Thanks Uldis, you are da man. One more question, is adaptive-noise-immunity suppose to play well with R52H card ?

9

Yes that did the trick!
Thank you!!!

10

I know the adaptive-noise-immunity is supposed to help in noisy environments, but what EXACTLY does it do?

11

Hi ;
Thanks for the post , i unchecked it in my MT .
but prefer if you guide us what is this for ?
with best regards.