topic Re: ICX 7450-48 appl process cpu usage in ICX Switches

ICX 7450-48 appl process cpu usage

tadesxz — Fri, 09 Oct 2020 17:08:34 GMT

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

Re: ICX 7450-48 appl process cpu usage

BenBeck — Fri, 09 Oct 2020 17:15:21 GMT

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.

Re: ICX 7450-48 appl process cpu usage

tadesxz — Fri, 09 Oct 2020 17:24:37 GMT

Hi Ben,

We will open a ticket and follow as you mentioned.

Thanks for your time!

Re: ICX 7450-48 appl process cpu usage

jijo_panangat — Sun, 11 Oct 2020 11:34:15 GMT

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

Re: ICX 7450-48 appl process cpu usage

lachancp — Tue, 01 Nov 2022 01:13:50 GMT

Was there a fix/resolution for this?

Re: ICX 7450-48 appl process cpu usage

BenBeck — Tue, 01 Nov 2022 02:05:07 GMT

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.

Re: ICX 7450-48 appl process cpu usage

AlexBish613 — Mon, 02 Oct 2023 14:37:01 GMT

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.