1

I have an issue with ACX2100, it report high CPU in FPC.

juniper@CSG-TBH_KXG_VU_NINH> show chassis fpc 
Aug 12 15:44:10
                     Temp  CPU Utilization (%)   CPU Utilization (%)  Memory    Utilization (%)
Slot State            (C)  Total  Interrupt      1min   5min   15min  DRAM (MB) Heap     Buffer
  0  Online            65     99          3        0      0      0    512        18         44
  1  Online            65     99          3        0      0      0    512        18         44

CPU of RE is normal.

juniper@CSG-TBH_KXG_VU_NINH> show chassis routing-engine 
Aug 12 15:44:59
Routing Engine status:
    Temperature                 47 degrees C / 116 degrees F
    DRAM                      1536 MB (2048 MB installed)
    Memory utilization          49 percent
    5 sec CPU utilization:
      User                       0 percent
      Background                 0 percent
      Kernel                     2 percent
      Interrupt                  0 percent
      Idle                      98 percent
    1 min CPU utilization:
      User                       3 percent
      Background                 0 percent
      Kernel                     4 percent
      Interrupt                  0 percent
      Idle                      92 percent

I checked in shell mode and saw that bcmDPC thread uses CPU more than usual.

FFEB(CSG-TBH_KXG_VU_NINH vty)# show sched
Total system uptime 367+16:42:33, (31769309840 ms), 142651053549 thread dispatches
CPU load is 99% (1 second), 99% (5 second)
            99% (10 second), 99% (1 minute)
Total interrupt time 1153266758 (ms)

 CPU       Name      Time(ms)
 72%       Idle      22894234261
 24%    Threads      7721452529
  3%        ISR      1153266758
  3%    Level 1      1152352432
  0%    Level 2      913880
  0%    Level 3      444

Last Long Running Thread Event time 100 ms

 CPU       Name      Time(ms)    Count

 Top Thread:
   pid      = 60
   name     = bcmDPC
   time     = 6567361774 ms
   cpu      = 20%

Pls help me on this case. Thank you.

1
  • Which firmware version is this on?
    – Zac67
    Commented Aug 14, 2022 at 6:35

1 Answer 1

3

Judging from the uptime value (>1 year), that ACX is running a firmware prior to 18.3R3 (January 2022) where this issue should be fixed:

  • bcmDPC task is high eventhough Interuppt START_BY_START flag set to 0.PR1329656

https://www.juniper.net/documentation/en_US/junos/information-products/topic-collections/release-notes/18.3/jd0e46.html#jd0e1208

2
  • My OS is Junos: 17.4R2-S9.1. I tried to restart feb and the issue was resolved.
    – NHN
    Commented Nov 2, 2022 at 8:50
  • The PR mentions workaround solution is "Resetting the flag using bcm command.". Can you share me bcm command to do reset?
    – NHN
    Commented Nov 28, 2022 at 7:31

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.