Btest / High CPU load affects Rx CCQ

RouterOS Wireless Networking
1

I am seeing weird issue with one of my RB911G-5HPnD.

When I run Bandwith test from the device to another device connected via LAN, immediately after Btest starts the Rx CCQ drops from 100% to 5%. As soon as the Btest is stopped, CCQ returns to 100%. The Tx bandwith is very low compared to another 911G connected to same switch. Same target and the difference is huge (10-15Mbps Tx on affected device, 90Mbps from another device to same target).

I guess its the only 911G which is using 40MHz channel single chain with nstreme. I am seeing this CCQ drop also when there is high traffic and CPU goes above 80%…

Has anyone experienced similar behavior?

Supout.rif sent to support.

2

I use never the same devices for do a bandwidth test.
The bandwidth test is CPU intensif .
As example : http://www.wirelessinfo.be/index.php/linktesten/sxtacpages/nv2-500-eceee

3

I know it is, normally not doing this, but I am trying to diagnose a problem I am seeing now - low tcp performance between devices connected to same Cisco switch… getting around 30Mbps with single TCP connection even I am sure there is no problem to max out the 100Mbps with devices using the 400MHz CPU.

And when I tried on the 911 I realized the CCQ went suddenly down to 3%. I have replaced this device with a new spare NetMetal 5, configured from scratch, upgraded to 6.22 but the problem is still there :frowning:

I am pretty sure even I know that the Btest is CPU intensive, I have never seen such behaviour which would lead to CCQ drop caused by either Btest or high CPU. Sometimes mostly on v6 devices I see SNMP causing high CPU usage but it never affected CCQ of wireless card.

4

not mostly in v6, bug is in v6 but not as u describe my CCQ drops 20-30% less maybe its my equipment better cpu

Why SNTP can case high cpu usage hm? (yes it is more random in v6 I never got answer)

5

What power supply do you use?

6

for the 911 I have used the standard 24V 0,8A (Cable is outdoor shielded carrier class Ubi Level 2 - 12m), when swapped the NetMetal used the original 24V 1,2A and installed new cable, this time its Ubi outdoor Level 1. I dont think it could be a power issue…

Tested more and when I switch to NV2 from nstreme its similar, the CCQ drops to 40% but doesnt go back up until the link goes down/up… Very strange..

7

Not only v6, I have had one 711G with 5.26 where SNMP suddenly maxed out the CPU and only restart fixed it. After upgrade to v6 all is fine..

What CPU do you have? x86?

8

my mistake I thought 911G has 400MHz, Ive made a test on Lite5 and Basebox5 600MhzCPU

9

Upgrade to 6.23rc7 as advised by support made thing even worse. Flash access is taking whole CPU time, link disconnecting etc.

Downgrade to 6.19 - FIXED! Btest pushing 200Mbps to a neighbor connected to same switch without affecting the CCQ… My GOD…

UPDATE: Just one thing not right with 6.19 - 20-30% CPU Usage by unclassified services which apparently has been solved in 6.22… But I cannot use that version as it has the problem described above :frowning:

10

Thanks to let us know.
Goodluck!