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ICX 7450-48 appl process cpu usage

unknown

Hi guys,

Hope you're well.

We've noticed a very strange behaviour in our ICX7450. We got a very high CPU usage but didn't ffind anything that justify it. This only occurs with CPU0. CPU1 is working fine as you can see below.

SSH@SPCRDC2ITA001#sh cpu-utilization
cpu0:
7 percent busy, from 4 sec ago
1 sec avg: 99 percent busy
5 sec avg: 8 percent busy
60 sec avg: 9 percent busy
300 sec avg: 7 percent busy
cpu1:
0 percent busy, from 2 sec ago
1 sec avg: 0 percent busy
5 sec avg: 0 percent busy
60 sec avg: 0 percent busy
300 sec avg: 0 percent busy

==========================

SSH@SPCRDC2ITA001#sh cpu-utilization tasks
top - 16:57:11 up 160 days, 13:54, 0 users, load average: 4.18, 4.02, 3.97
Threads: 163 total, 2 running, 161 sleeping, 0 stopped, 0 zombie
%Cpu0 : 87.0/12.3 99[||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ]
%Cpu1 : 0.0/0.0 0[ ]
GiB Mem : 22.8/1.951 [ ]
GiB Swap: 0.0/0.000 [ ]

The proccess that seems to be offendig this device is

1590 root 21 1 670.6m 369.9m 85.0 18.5 164688:55 R `- appl

So, there is a way to restart just this process or something like that? Do you know what is the cause of this usage for this task?

We are trying to avoid a device restart in this case.

Thanks in advance.

Regards,
Marcelo

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Accepted answers

BenBeck

Hey Marcelo,

I would advise opening a support case so we can troubleshoot what is hitting the CPU. I would not worry about appl in show cpu task. The generic fastiron process correlates with appl and generally shows as almost all of the usage there.

All comments

BenBeck

unknown

Hi Ben,

We will open a ticket and follow as you mentioned.

Thanks for your time!

jijo_panangat

Hi Marcelo,

Our architecture uses Broadcom SoCs and all execution run in cpu0 hence the cpu1 is zero, This is expected.Pls open a tac case for debugging the high cpu.

Thanks
Jijo

lachancp

Was there a fix/resolution for this?

BenBeck

High CPU (in 'show cpu') situations are generally unique, so it is hard to compare them. If you have high CPU and need help troubleshooting, please open a support case.

APPL task in 'show cpu task' will generally show the most usage (expected) even when overall CPU usage (value in 'show cpu') is low. This does not indicate a problem.

AlexBish613

We are experiencing a High CPU during the day on ICX 7250 running Switching (Layer 2 traffic) and we used to have a high CPU on ICX 7550 Router due to Layer 4 and 5 packets.
The reason why I mentioned both models is that both were connected to VSmart Zone and both were dropping CPU to 1% after I dsiconected them from SZ. So, we had the cas opened with Support and It took a lot itme to figure out why we had a hight CPU.