[cisco-nas] AS5300 NAS high CPU utilisation

[Souphonh Phounsavath]

Dear All,

I got very high CPU utilisation on AS5300 NAS while only 10 users are online. The process that uses 94% of CPU is TTY Background as below:

PID Runtime(ms)   Invoked      uSecs   5Sec   1Min   5Min TTY Process
   1           0         1          0  0.00%  0.00%  0.00%   0 Chunk Manager
   2      741616   5218495        142  0.00%  0.00%  0.00%   0 Load Meter
   3    11629672   1851679       6280  0.00%  0.08%  0.01%   0 PPP auth
   4    65427436   4125682      15858  0.00%  0.36%  0.30%   0 Check heaps
   5           0         9          0  0.00%  0.00%  0.00%   0 Chunk Manager
   6      103368    169450        610  0.00%  0.00%  0.00%   0 Pool Manager
   7           0         2          0  0.00%  0.00%  0.00%   0 Timers
   8       87464   5030762         17  0.00%  0.00%  0.00%   0 ALARM_TRIGGER_SC
   9      237396    249020        953  0.00%  0.00%  0.00%   0 Serial Backgroun
  10           0         1          0  0.00%  0.00%  0.00%   0 RM PROCESS
  11           0         1          0  0.00%  0.00%  0.00%   0 RM PROCESS
  12           0         1          0  0.00%  0.00%  0.00%   0 RM PROCESS
  13           0         1          0  0.00%  0.00%  0.00%   0 RM PROCESS
  14           0         2          0  0.00%  0.00%  0.00%   0 CAS Process
  15     1248236   2614131        477  0.00%  0.00%  0.00%   0 ARP Input
  16      365476   6342439         57  0.00%  0.00%  0.00%   0 HC Counter Timer
  17       65124    513573        126  0.00%  0.00%  0.00%   0 DDR Timers
  18           0         2          0  0.00%  0.00%  0.00%   0 Dialer event
  19           4         2       2000  0.00%  0.00%  0.00%   0 Entity MIB API
  20           0         1          0  0.00%  0.00%  0.00%   0 SERIAL A'detect
  21           0         2          0  0.00%  0.00%  0.00%   0 Critical Bkgnd
  22    20308172  10414340       1950  0.00%  0.08%  0.07%   0 Net Background
  23      153652   1724628         89  0.00%  0.00%  0.00%   0 Logger
  24  1377289684  39898572      34520 97.96% 94.87% 94.02%   0 TTY Background

Anyone has any idea, please suggest.

Regards,
Souphonh
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