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Solved
Occasional wireless traffic hang
I am seeing occasional hangs on my WAP network. Ssh to the WAP normally shows 95% idle and 0% isrq for top:
Tue Jan 22 23:00:01 UTC 2019
23:00:01 up 1 day, 23:54, load average: 3.01, 3.01, 3.04
Me...
I am happy to report that firmware 3.9.1.0 has been released, and I think it fixes the problem reported in this thread. The release notes document is dated August 13, 2019, mention these two fixes:
1. Addressed intermittent, rarely encountered access point hang issues.
2. Fixed various stability and connectivity issues.I think this closes the issue. I will keep my monitoring in place for another year to verify the fix. Thanks to all who helped.
As an update to this report, the 50% sirq continued for 17 hours, until I rebooted the WAP. You can see the dramatic change at exactly 2 days of uptime in these hourly 'top' reports:
CPU: 0% usr 4% sys 0% nic 95% idle 0% io 0% irq 0% sirq CPU: 0% usr 4% sys 0% nic 95% idle 0% io 0% irq 0% sirq CPU: 0% usr 4% sys 0% nic 95% idle 0% io 0% irq 0% sirq CPU: 0% usr 4% sys 0% nic 95% idle 0% io 0% irq 0% sirq CPU: 0% usr 4% sys 0% nic 95% idle 0% io 0% irq 0% sirq CPU: 4% usr 0% sys 0% nic 95% idle 0% io 0% irq 0% sirq CPU: 0% usr 0% sys 0% nic 50% idle 0% io 0% irq 50% sirq CPU: 0% usr 0% sys 0% nic 50% idle 0% io 0% irq 50% sirq CPU: 0% usr 4% sys 0% nic 45% idle 0% io 0% irq 50% sirq CPU: 0% usr 0% sys 0% nic 50% idle 0% io 0% irq 50% sirq CPU: 0% usr 0% sys 0% nic 50% idle 0% io 0% irq 50% sirq CPU: 4% usr 4% sys 0% nic 40% idle 0% io 0% irq 50% sirq
After 17 hours of 50% sirq but before the WAP reboot, I disconnected every wifi device from the WAP, and verified there were no connected devices from the WAP dashboard, but the WAP was still showing 50% sirq. I just rebooted the WAP and it is back to 0% sirq, and not slow.
I will keep monitoring 'top' after the reboot and get an alert if sirq% gets high. I am curious to see if it gets a high sirq% at exactly two days of uptime again. Does something special happen to the WAP at two days of uptime? I could automatically reboot the WAP when the sirq% gets high, but that hardly seems like a clean fix.
Looks very familiar - WAC730, 3.9.0.3, ... slow or intermittent wireless access only after some uptime
WAC730-1# uptime
00:26:48 up 3 days, 1:47, load average: 4.07, 4.08, 4.06
WAC730-1# top
Mem: 77560K used, 177568K free, 0K shrd, 0K buff, 20776K cached
CPU: 0% usr 0% sys 0% nic 49% idle 0% io 0% irq 50% sirq
Load average: 4.03 4.04 4.05 3/70 4210
PID PPID USER STAT VSZ %MEM CPU %CPU COMMAND
9 2 root RW 0 0% 1 47% [ksoftirqd/1]
...
Ah, interesting. I have a Debian server with ssh access to the WAP so I can monitor the 'top' output and get an alert when sirq gets high. Once it happens again, I will try reverting to a previous firmware, maybe 3.8.3.0, and see if it happens again.
My family has been complaining about wifi hangs and disconnects for about six months, and that matches the time I installed the 3.9.0.3 firmware. It will take me perhaps another week to come to a conslusion on this. I will keep reporting on my progress.
bmomjian wrote:
Ah, interesting. I have a Debian server with ssh access to the WAP so I can monitor the 'top' output and get an alert when sirq gets high. Once it happens again, ...
Before reverting, go to Monitoring -> Logs -> Save As ... and put the .tar to any cloud share, and seend the link to RaghuHR for Netgear inspection.
OK, I will grab the logs once it happens again, though I have sent 50% sirq logs to you before and you said it looked fine.
Another odd one - skipping a MAC address without any indication in the product logs:
WAC730-1# dmesg
processpmq: skip entry with mc/bc address 41:4e:36:84:48:6e
wl1: wlc_bmac_processpmq: skip entry with mc/bc address 41:4e:36:84:48:6e
wl1: wlc_bmac_processpmq: skip entry with mc/bc address 41:4e:36:84:48:6e
...It's a valid device, a HTC phone.
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