7600 process XDR LC PRIO cpu 100%

[etn]

i have

Route Switch Processor 720    RSP720-3CXL-GE   

CEF720 4 port 10-Gigabit Ethernet      WS-X6704-10GE    

+ ios 12.2(33)SRE2

the same on ios c7600rsp72043_rp-IPSERVICES-M), Version 15.1(3)S0a

some times

rem com sw sh proc cpu s

CPU utilization for five seconds: 7%/0%; one minute: 6%; five minutes: 6%

PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process

277           8        1912          4 100.00% 42.05% 40.82%   0 XDR LC PRIO Crit

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

135      417280     2123114        196  3.83%  3.80%  3.83%   0 slcp process    

far CPU utilization RP go to 100%

i do

clear cef linecard

CPU utilization go to 0%

some times per week

what is wrong ?

[etn]

set up new ios c7600rsp72043_rp-IPSERVICESK9-M), Version 12.2(33)SRE5

situation do not change

[rsimoni]

Hi Alex,

quick notation first; when you check "remote command switch show process cpu" you are actually checking the CPU utilization on the SP not on the RP.

Beside that what you see is just a cosmetic issue (wrong cpu utilization reading) documented in

CSCtf55740    XDR LC Prio Crit process showing 5sec CPU usage at 100%

====

Symptom:

     High CPU utilization reported due to "XDR LC Prio Crit" process.

     Conditions:

     This issue is seen in the Switch Processor (SP) of Sup720 engines running

  12.2(33)SRE1 release.

     CPU utilization for the above mentioned process is not reported correctly.

     for example, the switch reports the total CPU usage as 3%, while the CPU

  usage for this specific process as 100% for 5sec and 49% for 5min Avg.

     7600A#remote login switch

     7600A-sp#show process cpu sorted 1min

     CPU utilization for five seconds: 3%/0%; one minute: 3%; five minutes: 3%

      PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process

      288         352        5746         61 100.00% 52.13% 49.63%   0 XDR LC

  PRIO Crit

      177      699848      108108       6473  1.51%  1.51%  1.51%   0 Vlan

  Statistics 

      180      223304       34033       6561  1.03%  0.47%  0.46%   0 TYFIB Table

  Mana

      136       48812     6752273          7  0.47%  0.45%  0.45%   0 slcp process

      376      102932       57572       1787  0.00%  0.27%  0.27%   0 Env Poll  

     As the CPU usage reported for this process is NOT correct, it should NOT

  have any impact to the performance. This bug is cosmetic.

     Workaround:

     None.

     This issue is cosmetic.

=====

Since it is cosmetic it will not be fixed in SRE train but only in 15.1S. Check the bug to see which exact cco rebuild will contain the fix. In the meantime don't be worried 

Riccardo

[etn]

Hi, Riccardo !

>As the CPU usage reported for this process is NOT correct, it should NOT

> have any impact to the performance. This bug is cosmetic.

may be "This bug is cosmetic" in sp on ios sre

BUT i try newest ios 15.1(3)S0a and obtain low traffic on interface in highest cpu - to 100%

after clear cef linicard i obtain growing traffic and cpu 0%

#sh proc cpu s

CPU utilization for five seconds: 87%/83%; one minute: 91%; five minutes: 96%

PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process

   7     1711512       87883      19474  4.06%  0.84%  0.89%   0 Check heaps     

245        5688    10115351          0  0.16%  0.12%  0.13%   0 Ethernet Msec Ti

210        2276     2538856          0  0.08%  0.02%  0.01%   0 IP ARP Retry Age

211       44772      267882        167  0.08%  0.04%  0.05%   0 IP Input        

244         428      326057          1  0.08%  0.00%  0.00%   0 Ethernet Timer C

#clear cef linecard

#sh proc cpu s

CPU utilization for five seconds: 0%/0%; one minute: 3%; five minutes: 3%

PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process

157       36588        1511      24214  0.23%  0.02%  0.00%   0 Per-minute Jobs 

346      110540       43940       2515  0.15%  0.06%  0.05%   0 HIDDEN VLAN Proc

211       45600      280259        162  0.07%  0.04%  0.03%   0 IP Input        

[rsimoni]

Hi Alex,

I think that the SP CPU utilization is not related to what you are seeing now, which is RP CPU utilization in interrupts (no process is really going high but it is high CPU at interrupt level).

The fact that it goes away after you clear cef, which implies a TCAM reprogramming, might indicate some some kind of wrong/missing hardware programming on your PFC/DFC.

You might want to check with the TAC; anyway it is not related to 'XDR LC Prio Crit' going high on the SP.

Riccardo

[etn]

ok, thanx

i create other theme

[rsimoni]

ok,

please rate/close this question then

Riccardo