RT-AC87U 2x CPU on 100%

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Dombo

Occasional Visitor
Dear all.
Running a few years great. Latstes merlin on the router.

Only sinds a few eaks trouble and not good working internet.
I see 2x cpu running on 100%.
need a poweroff to get the cpu slowing down.
This works for a few days..

Any one that now how i can see what this problem should be?
ScreenShot035.png
 

gattaca

Senior Member
I'm seeing near 100% pCPUs running 384.19 on an AC86U... posted about it in the main 384.19 thread. You would have to check the router logs... IDK what's causing it at this point. Hoping others report similar. Stay safe, stay alive. Peace.
 

aslak

New Around Here
Do you know the write speed of the USB you're using? Swapping my shirtty one for a better one stopped 100% CPU use for me.
 

GSpock

Senior Member
... had something similar but on 1 cpu and after a health scan of USB, problem was gone ....
 

JS_racer

Occasional Visitor
... had something similar but on 1 cpu and after a health scan of USB, problem was gone ....
ok, scanned drive, cant hurt.
also seeing the high cpu on my ac86u

i am not running any scripts i know of, just a basic setup for years and years... ( have ai protection on ) i have Enable JFFS turned off.
say, what level of my system logs should i have selected ?? default, and log only... just looking for help here with what levels work well.
 
Last edited:

Dombo

Occasional Visitor
Hi again...
Ni usb on a usb port.
No other settings
After 3 day cpu2 running or 100%
Perhaps you can see something?
ScreenShot171.png


ScreenShot169.png



ScreenShot170.png
 

RMerlin

Asuswrt-Merlin dev
Run "top" over SSH to see what is using the CPU.
 

Dombo

Occasional Visitor
sorry... dombo here:
Code:
Mem: 209032K used, 46644K free, 10200K shrd, 796K buff, 21452K cached
CPU:  0.5% usr  1.1% sys  0.0% nic 48.5% idle 49.0% io  0.0% irq  0.6% sirq
Load average: 5.13 5.14 5.14 2/115 12794
  PID  PPID USER     STAT   VSZ %VSZ CPU %CPU COMMAND
  202     1 DeMeursj R     5140  2.0   1  0.6 nt_center
  179     1 DeMeursj S      652  0.2   0  0.3 tftpd
  295     1 DeMeursj S    11032  4.3   1  0.2 /usr/sbin/lighttpd-monitor
  259     1 DeMeursj S     5328  2.0   0  0.2 watchdog02
  297     1 DeMeursj S     5728  2.2   0  0.1 mastiff
  200   199 DeMeursj S     4980  1.9   0  0.1 nt_monitor
  189     1 DeMeursj S     2604  1.0   0  0.1 protect_srv
12767 12759 DeMeursj R     1428  0.5   1  0.1 top
   36     2 DeMeursj SW       0  0.0   1  0.1 [kworker/1:1]
  634     1 DeMeursj S    14120  5.5   1  0.0 /usr/sbin/lighttpd -f /tmp/lighttpd.conf -D
  254     1 DeMeursj S     6916  2.7   0  0.0 httpd -i br0
  277     1 DeMeursj D     6548  2.5   0  0.0 networkmap --bootwait
  253     1 DeMeursj S     6236  2.4   0  0.0 httpds -s -i br0 -p 8443
  394     1 DeMeursj S     6072  2.3   0  0.0 /usr/sbin/smbd -D -s /etc/smb.conf
  378     1 DeMeursj S     5904  2.3   0  0.0 nmbd -D -s /etc/smb.conf
  414   412 DeMeursj S     5728  2.2   1  0.0 mastiff
  412   297 DeMeursj S     5728  2.2   0  0.0 mastiff
  413   412 DeMeursj S     5728  2.2   0  0.0 mastiff
  379   378 DeMeursj S     5592  2.1   1  0.0 nmbd -D -s /etc/smb.conf
  258     1 DeMeursj S     5392  2.1   1  0.0 watchdog
  197   190 DeMeursj S     5348  2.0   1  0.0 /sbin/netool
  190     1 DeMeursj S     5348  2.0   0  0.0 /sbin/netool
  198   197 DeMeursj S     5348  2.0   0  0.0 /sbin/netool
    1     0 DeMeursj S     5340  2.0   1  0.0 /sbin/preinit
  163     1 DeMeursj S     5332  2.0   0  0.0 /sbin/wanduck
  719     1 DeMeursj S     5328  2.0   1  0.0 bwdpi_wred_alive
  358     1 DeMeursj S     5328  2.0   0  0.0 erp_monitor
  300     1 DeMeursj S     5328  2.0   0  0.0 pctime
  299     1 DeMeursj S     5328  2.0   1  0.0 hour_monitor
  541     1 DeMeursj S     5328  2.0   1  0.0 usbled
  627     1 DeMeursj S     5328  2.0   0  0.0 disk_monitor
  224     1 DeMeursj S     5328  2.0   0  0.0 wpsaide
  298     1 DeMeursj S     5328  2.0   0  0.0 bwdpi_check
   71     1 DeMeursj S     5324  2.0   1  0.0 console
  206   202 DeMeursj S     5140  2.0   0  0.0 nt_center
  207   206 DeMeursj S     5140  2.0   0  0.0 nt_center
  236   199 DeMeursj S     4980  1.9   1  0.0 nt_monitor
  188     1 DeMeursj S     4980  1.9   1  0.0 nt_monitor
  199   188 DeMeursj S     4980  1.9   1  0.0 nt_monitor
16521   299 DeMeursj D     4144  1.6   1  0.0 TrafficAnalyzer -e
  257     1 DeMeursj S     3644  1.4   0  0.0 sysstate
  263     1 DeMeursj S     3372  1.3   0  0.0 rstats
20783     1 nobody   S     3352  1.3   1  0.0 dnsmasq --log-async
  545   542 DeMeursj S     2980  1.1   0  0.0 u2ec
  542     1 DeMeursj S     2980  1.1   0  0.0 u2ec
  546   545 DeMeursj S     2980  1.1   1  0.0 u2ec
  691   690 DeMeursj S     2836  1.1   1  0.0 wred -B
  690   689 DeMeursj S     2836  1.1   0  0.0 wred -B
 

RMerlin

Asuswrt-Merlin dev
sorry... dombo here:
Code:
Mem: 209032K used, 46644K free, 10200K shrd, 796K buff, 21452K cached
CPU:  0.5% usr  1.1% sys  0.0% nic 48.5% idle 49.0% io  0.0% irq  0.6% sirq
Load average: 5.13 5.14 5.14 2/115 12794
  PID  PPID USER     STAT   VSZ %VSZ CPU %CPU COMMAND
  202     1 DeMeursj R     5140  2.0   1  0.6 nt_center
  179     1 DeMeursj S      652  0.2   0  0.3 tftpd
  295     1 DeMeursj S    11032  4.3   1  0.2 /usr/sbin/lighttpd-monitor
  259     1 DeMeursj S     5328  2.0   0  0.2 watchdog02
  297     1 DeMeursj S     5728  2.2   0  0.1 mastiff
  200   199 DeMeursj S     4980  1.9   0  0.1 nt_monitor
  189     1 DeMeursj S     2604  1.0   0  0.1 protect_srv
12767 12759 DeMeursj R     1428  0.5   1  0.1 top
   36     2 DeMeursj SW       0  0.0   1  0.1 [kworker/1:1]
  634     1 DeMeursj S    14120  5.5   1  0.0 /usr/sbin/lighttpd -f /tmp/lighttpd.conf -D
  254     1 DeMeursj S     6916  2.7   0  0.0 httpd -i br0
  277     1 DeMeursj D     6548  2.5   0  0.0 networkmap --bootwait
  253     1 DeMeursj S     6236  2.4   0  0.0 httpds -s -i br0 -p 8443
  394     1 DeMeursj S     6072  2.3   0  0.0 /usr/sbin/smbd -D -s /etc/smb.conf
  378     1 DeMeursj S     5904  2.3   0  0.0 nmbd -D -s /etc/smb.conf
  414   412 DeMeursj S     5728  2.2   1  0.0 mastiff
  412   297 DeMeursj S     5728  2.2   0  0.0 mastiff
  413   412 DeMeursj S     5728  2.2   0  0.0 mastiff
  379   378 DeMeursj S     5592  2.1   1  0.0 nmbd -D -s /etc/smb.conf
  258     1 DeMeursj S     5392  2.1   1  0.0 watchdog
  197   190 DeMeursj S     5348  2.0   1  0.0 /sbin/netool
  190     1 DeMeursj S     5348  2.0   0  0.0 /sbin/netool
  198   197 DeMeursj S     5348  2.0   0  0.0 /sbin/netool
    1     0 DeMeursj S     5340  2.0   1  0.0 /sbin/preinit
  163     1 DeMeursj S     5332  2.0   0  0.0 /sbin/wanduck
  719     1 DeMeursj S     5328  2.0   1  0.0 bwdpi_wred_alive
  358     1 DeMeursj S     5328  2.0   0  0.0 erp_monitor
  300     1 DeMeursj S     5328  2.0   0  0.0 pctime
  299     1 DeMeursj S     5328  2.0   1  0.0 hour_monitor
  541     1 DeMeursj S     5328  2.0   1  0.0 usbled
  627     1 DeMeursj S     5328  2.0   0  0.0 disk_monitor
  224     1 DeMeursj S     5328  2.0   0  0.0 wpsaide
  298     1 DeMeursj S     5328  2.0   0  0.0 bwdpi_check
   71     1 DeMeursj S     5324  2.0   1  0.0 console
  206   202 DeMeursj S     5140  2.0   0  0.0 nt_center
  207   206 DeMeursj S     5140  2.0   0  0.0 nt_center
  236   199 DeMeursj S     4980  1.9   1  0.0 nt_monitor
  188     1 DeMeursj S     4980  1.9   1  0.0 nt_monitor
  199   188 DeMeursj S     4980  1.9   1  0.0 nt_monitor
16521   299 DeMeursj D     4144  1.6   1  0.0 TrafficAnalyzer -e
  257     1 DeMeursj S     3644  1.4   0  0.0 sysstate
  263     1 DeMeursj S     3372  1.3   0  0.0 rstats
20783     1 nobody   S     3352  1.3   1  0.0 dnsmasq --log-async
  545   542 DeMeursj S     2980  1.1   0  0.0 u2ec
  542     1 DeMeursj S     2980  1.1   0  0.0 u2ec
  546   545 DeMeursj S     2980  1.1   1  0.0 u2ec
  691   690 DeMeursj S     2836  1.1   1  0.0 wred -B
  690   689 DeMeursj S     2836  1.1   0  0.0 wred -B

That CPU is pegged doing IO. If you have a USB disk plugged in try unplugging.
 

Dombo

Occasional Visitor
there is no usb in to the router..
That was the last time a problem only now there is no other thing in to
 

archiel

Senior Member
there is no usb in to the router..
That was the last time a problem only now there is no other thing in to
What other devices do you have connected - what happens if you move them to different ports / change the cables?
 

Dombo

Occasional Visitor
no other things @ all..
I changed the lan cables i reboot i power off..
in 5 minute the first cpu is @ 100 %
 

archiel

Senior Member
In your screen prints above I can see devices on Lan 2 and Lan 4, are these now disconnected? Are you accessing the router via wifi? What happens if you disable 2.4 and connect on 5.0 (and vice versa)?

You could also try enabling dual wan, which will allow you to use a lan port for the wan connection and connect your modem to the secondary port.

Assuming none of the above work, and powering down and rebooting from cold does not work then the possible/ probable causes seem to be

Faulty power supply
hardware fault on the router
hardware fault on the modem.
 

El Mariachi

Occasional Visitor
What scripts do you have installed?
 

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