[cisco-nas] AS5300 NAS high CPU utilisation

[Aaron Leonard]

Souphonh,

I don't see below what IOS version you're running, but here are some 
likely candidate bugs involving high CPU in TTY Background:

CSCdm01508: TTY Background hold 30% CPU Process
Version: 012.000
Integrated-releases: 012.000(004.001) 11.3(09.02)AA 12.0(04.02)S 
12.0(04.00.03)PI05 12.0(04.00.04)PI05 12.0(04.03)T 12.0(04.02)PI05 
12.0(04)XJ 12.0(04.06)W05(11.00.09)

CSCdy01705: High cpu at process TTY Background
Version: 12.2(10A)
Integrated-releases: 12.2(18)SXE 12.2(15)BC02e 12.2(18)S06 12.2(20)S05 
12.1(21.04)EC 12.3(07)XI 12.1(21.03)E04 12.2(21.07)S 12.2(21.05)S 
012.002(021.006) 012.002(021) 12.3(02.03)B 12.2(11)T09 12.3(01.06)T 
012.003(001.006)

CSCed16920: Constant high CPU in TTY background
Version: 12.2S 12.3(03a)
Integrated-releases: 12.2(18)SXE 12.0(28)S02 12.0(30.01)S 12.2(18)EW02 
12.3(02)T09 12.3(04)T09 12.2(20)SE03 12.1(22)E03 012.002(026) 
012.002(026.005) 012.003(005.014) 12.0(29.04)S01 12.1(22.04)E 
12.2(18)S06 12.2(18)SXD 12.2(20)S05 12.2(22)S02 12.2(23c) 12.2(24.08)S02 
12.2(25.04)S 12.3(06.01)T 12.3(07)XI

Cheers,

Aaron

------------------------------------------------------------------------


> 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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