Source
r/Ubiquiti•
Rumbaar

UAP-AC-PRO running at 98% CPU after 8+ days of activity

Question

Has anyone else found their UAP-AC-PRO running at high CPU usage after a number of days? THis appears to only have started happening after the 2nd last or firmware upgrades to those AP's.

I have two AP that service around 70-80 clients, majority are 2.4g and usually a 70/30% split between the two AP's (but can't seem to get an even split). The higher client unit, over time, will climb to max CPU usage and sit at 98%+ until restarted.

Running latest controller ( atag_6.2.26_15319) and firmware (4.3.28.11361) for those units. Any suggestions on how to check what is going wrong with the units.

Running a USG-Pro-4 + US-48-G1 & US-16-150W, at latest firmwares.

Posted Aug 30, 2021, 10:56 AM UTC

2743
PickUpThatLitter•

IMHO, any firmware after 4.3.24.11355 has too many issues to use. Try rolling back to an earlier version and see if the issue persists.

12
TheDarthSnarf🛡️🖧 📡•

Agreed.

My APs ramped up so high CPU that devices could associate with the AP, but it wouldn't ever pull DHCP.

Rebooted, eventually the issue repeated - so I rolled back. No resolved the issues.

4
RumbaarOP•

What firmware version are you running at? 4.3.24?

2
TheDarthSnarf🛡️🖧 📡•

Yes - 4.3.24.11355

3
RumbaarOP•

Thx, I'm trying downgrade to that firmware.

1
Arkanian410•

4.3.28.11361 with 3x UAP-AC-PRO's and no issues. Uptime showing 89 days.

https://imgur.com/BPtWUKm

3
RumbaarOP•

Do you have a reconmendation for a more stable version? But yes, I try and no upgrade as they come out. Hoping to hear of any issues. It's a hot mess :(

2
b1gtedUnifi User•

FWIW:

I am running the latest firmware. 4.3.28 on 2 UAP-AC-PRO's, they both carry about 20 or 30 clients each. I just looked, both have been up for 16 days, and one is at 33.4% memory and the other is at 33.3% memory.

​

With triple the clients that I have, is it possible that this would be normal? Is 80 clients pushing the envelope on these AP's? Just curious myself.

3
RumbaarOP•

They should handle 200+ clients. I'm now running at 15/17% CPU usage agate a restart/downgrade. I'll see how it goes, and see if it rises to max again over a week or so.

2
b1gtedUnifi User•

good to know, I hadn't looked up exactly what the limit was on clients for these particular models.

Please keep us informed on how it goes. I would like to know if the downgrade fixed your issue or not.

Thanks!

3
kayak83•

I only have 12 clients on mine and most are just things connected and doing nothing at the moment (tablets, kindles, etc)- home use. Memory is at 50% +/-. Been up for 200 days, which is pretty much just the last time we lost power. Also on 4.3.28. I have it on auto-update because I'm lazy and it's just home use...

Edit: Also 90% CPU use after looking.

1
horsepowerphoto•

Its not the memory.. Its the CPU

1
b1gtedUnifi User•

Oops. Just looked cpu is even less. Like 15%

1
Donut-Farts•

Checked my two UAP-AC-Pros running in my office running 4.3.28.11361 and no issues on either one. Running with a USG-3P on version 4.4.55.5377096.

If it matters, running a cloud key with controller software version 6.1.71

3
RumbaarOP•

Thx for checking, how many clients do you normally service? Prior to a week or so ago, I was running version 5 controller. But upgraded to try and see it would fix the issue.

2
Donut-Farts•

Our average wireless client load rarely passes 30, but when it does it's for events where we can have over 100 clients simultaneously. No issues yet

2
RumbaarOP•

Ah, so they are temporary clients and not persistently services clients?

2
Donut-Farts•

Not typically. We typically have 20-25 regular clients but host events where we get an additional 75-100 clients for 6-8 hours at a time

1
Spooky_Ghost•

where do you check CPU usage? I only see memory

1
b1gtedUnifi User•

It’s under statistics

2
kayak83•

Where do we see CPU usage? I only see memory.

3
bat-fink•

Yeah, all I see is memory too. But my UDM-PRO and UAP-AC-PRO's are all up to date.

2
b1gtedUnifi User•

It’s under the statistics option.

1
kayak83•

Thanks. Curiously, I had to revert to classic settings UI to get the statistics page to show. Anyway, I'm now seeing that my AP is running 78-80% 90% CPU. Down the next rabbit hole I go...

1
b1gtedUnifi User•

You shouldn't have to go to classic. I was referring to statistics from the iPhone app. But if you are on your PC and are in your dashboard, then go-to devices. You can turn on memory and CPU under the filters of that page.

See my screenshot

https://imgur.com/a/P1Rhqbd

1
kayak83•

I meant that for some reason the Statistics page wouldn't load until I switched the UI back over to classic.

Also, found that on PC you can just hover over the device and it'll show CPU and memory load. But, mine shows 8% CPU when I do that and 80% CPU on the Statistics page. That's...quite a discrepancy.

I'm on Android and always just go to the browser bookmark I have in Firefox. I'll give the app a try.

2
WeirdEngineerDude•

FYI, just checked my three NanoHD’s and they aren’t doing that. Must be model specific.

2
RumbaarOP•

Thanks for checking, yeah the nanoHD appear to running fundamentally different firmware

1
julietscause•

I had to bump back down to 4.3.21 for various reasons.

Have you tried that?

2
RumbaarOP•

I've now downgraded to 4.3.24 and see how that goes, will go further down if that doesn't help.

1
julietscause•

We use wireless uplink and 4.3.21 seems to have the least amount of issues for our environment.

2
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1
Taverner_•

I've got a site with about 20 UAP-AC-Pros, many of which are having similar issues. If they're not rebooted every week or so they'll start having issues - the specifics vary, but they'll generally stop responding to the controller and some will start having issues with RADIUS auth etc.

1
RumbaarOP•

That's not good to read. Yeah when it's sitting at 98% for hours on end, the reliability goes down for me. Not being able to force an even split over AP is something I wish I manage better within the system. My AP a are above and below each other on a multilevel install.

1
ebenenspinneUnifi User•

I never install any UniFi updates until I’m forced to.

1
RumbaarOP•

I tend to be like this, only recently went to version 6 of the controller. But in two minds, if I leave to long and then have to, the jump in firmware can be another source of issue that needs to be managed.

1
dexahexatris•

Where do you check CPU usage? I only see memory usage in the unifi software (new interface).

Edit: Nevermind, it's a hidden column under the UNIFI DEVICES section.

1
bat-fink•

yeah i see it now. u/Rumbaar

1 UAP-AC-PRO at ~13% cpu load with 3 devices 1 UAP-AC-PRO at ~9% cpu load with 17 devices

Both are on 4.3.28 firmware.

3
RumbaarOP•

Thanks for that, not sure if it's when it has to service a number of clients or type of client. Yeah in the new interface is not as good as the old for a meaningful dashboard.

1
dlangille•

Mine are on 4.3.28.11361 - no such issues.

They have 187 days of uptime. Sorry, I can't help more than that.

1
RumbaarOP•

How many clients do they service?

2
dlangille•

At present, 17 and 18 clients each.

1