farzan_qureshi_6zvtyjj370nj2's profile

9 Messages

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160 Points

Fri, Dec 13, 2019 5:47 AM

Reached Buffer limit

Hi there,

We are using H510s at a customer site. I see following in the AP syslog:

Dec 13 05:10:12 kern.warn kernel: [84170.752918] Reached buffer limit
Dec 13 05:10:12  kern.warn kernel: [84170.755246] Reached buffer limit
Dec 13 05:10:12  kern.warn kernel: [84170.757607] Reached buffer limit
Dec 13 05:10:12  kern.warn kernel: [84170.763184] Reached buffer limit
Dec 13 05:10:12  kern.warn kernel: [84170.765507] Reached buffer limit
Dec 13 05:10:12  kern.warn kernel: [84170.767782] Reached buffer limit

Following is the version command output:


Ruckus H510 Multimedia Hotzone Wireless AP
Version: 5.1.1.0.624

The APs are managed by Vsz 5.1.1.0.5985.1.0

Any ideas what may be the reason? We are getting complaints from the users that they are not able to associate to AP.

Official Rep

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259 Messages

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4.4K Points

2 y ago

Hi Farzan,

Seems like the AP memory might be getting full.

Is this happening for all the H510 APs?
Is the AP configuration getting updated? Click on the AP and check for the "Configuration Status".

Download the AP support file and check the "Device Info" for CPU and Memory information.

9 Messages

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160 Points

Hi Sanjay,
Yes we see it on all H510s in the environment.

The configuration is getting updated. I will check the device info and report back.

9 Messages

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160 Points

The CPU usage is sitting at 0%

CPU     : 0.00%
Load    : 0.07 0.08 0.09 1/127 4145
Memory  : 225420 KB (free), 7712 KB (cache) 233132 KB (available) 470460 KB (total)

This is when only one client connected and I still see this message in the logs

kern.warn kernel: [1551239.199465] Reached buffer limit
Brand User

Former Employee

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2.6K Messages

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44.8K Points

2 y ago

Is this AP in a high density environment?  How many clients on the AP when you see this?

9 Messages

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160 Points

Hi Michael,
No, it is not. There are only a handful of users on the APs say 4 to 6.

5 Messages

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100 Points

5 m ago

Any update or findings on this? We are seeing the same in the logs on low density R500/R510 installs. 5-15 clients max.

kern.warn kernel: [84170.765507] Reached buffer limit

5 Messages

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100 Points

Also see this a lot;

Priority: emerg
Tag: syslog
Message: upgrade_debug: pid=27614, get_ap_list(): ap-list found !!

9 Messages

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160 Points

@paul_johnson

What firmware version are the APs on? 

5 Messages

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100 Points

They were on ZD awhile back but now several are on latest unleashed R500 200.7 in a separate area.

9 Messages

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160 Points

So for us it got resolved when we moved from version 5.1 to 5.2. We don't see any buffer overflow errors. I am not sure about Unleashed version. It they are already on latest version then nothing that you can do other than log it with Ruckus Support.

5 Messages

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100 Points

5 m ago

This seems to be the pattern of logs;

kernel: ol_rc_update_handler: WARNING: handler called without transmit attempts

wifi0: 63661671 : stuck beacon (missed 3) scanning 0, syncbeacon 0, sc_beacons 1,sc_isCaldone: 1

12:18:11 ZD-APMgr: IPC_thread rcv ping from TACMON 
12:17:56 kernel: Reached buffer limit
12:17:56 syslog: bba: STAs from 2.4g to 5g.
12:17:56 syslog: bba: sta-2g=6 sta-5g=1 perc=50 sta-2g-expect=3

11:17:56 kernel: Reached buffer limit
11:17:56 syslog: bba: STAs from 2.4g to 5g.
11:17:56 syslog: bba: sta-2g=6 sta-5g=3 perc=50 sta-2g-expect=4

Official Rep

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1.3K Messages

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17.7K Points

Hi Paul,

Is there any service impact of this?

Regards,

Syamantak Omer

Official Rep | Staff TSE | CWNA | CCNA | RASZA | RICXI

Follow me on Linkedin

5 Messages

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100 Points

There are service impacts at the site and we are trying to narrow down the cause, we are not certain this has anything to do with it but buffer limit reached and stuck beacons stood out in the logs.

Clients complain of service degradation, two VPN users complain throughout the day performance gets worse and very slow speed (daily traffic about 400-700mb each of these two clients) . Also intermittent iPhone "unable to connect to network" with correct credentials and good RSSI.

5-15 clients max, load and band balancing is off

(edited)

9 Messages

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160 Points

With iPhones, they have introduced random mac address feature. Try to disable it and then see how it goes.

Also, disable RSSI threshold if you have enabled on the APs where a device should be able to communicate with RSSI of -67 or something stronger to get a response from the AP.

Also, if you have 80 Mhz channels enabled, please decrease the bw to 40 Mhz channel or even 20 Mhz if the data requirements are not that high. Honestly, 20 Mhz will serve the purpose well and client devices will have stable connection health. However, placement of APs also matter.

I am sure you have already checked for the channel overlap in the premises. 

Also, if channel fly is enabled, please move to background scanning and increase the scan interval to 3600sec.

Let us know how it goes.

Official Rep

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1.3K Messages

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17.7K Points

Hi @paul_johnson ,

I do not think this log is relevant to any of the service impact you are facing.

I would suggest open a case with RUCKUS support and share all the information you have related to the actual service impact and what clients are facing.

Regards,

Syamantak Omer

Official Rep | Staff TSE | CWNA | CCNA | RASZA | RICXI

Follow me on Linkedin

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