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Lenovo Technology Partner
Posts: 66
Registered: ‎04-29-2015
Location: US
Views: 318
Message 1 of 5

Weird results from "sh process cpu history" and "clear cpu"

See below to see what I am talking about, but basically eveyr time I issue the command "clear cpu" and then do a "show process cpu history" the output changes and adds one line.  The new line looks like the system is at 100 or so per cent utilization, but if I do a "show process cpu" or whataever nothing is really going on - all of the numbers are very low.

Can anyone explain this?

The "show process cpu history" command seems to be useless.

 

svl-bc-8332l100ay30-1#sh proc cpu hist

---------------------------------------------
CPU Utilization History
---------------------------------------------
 91 (DMCA)   1% at   5:18:07 Mon Jun  4, 2018
 93 (ARP )  67% at   5:18:15 Mon Jun  4, 2018
 93 (ARP ) 100% at   5:18:16 Mon Jun  4, 2018
---------------------------------------------

svl-bc-8332l100ay30-1#clear cpu
CPU statistics cleared.
svl-bc-8332l100ay30-1#sh proc cpu hist

---------------------------------------------
CPU Utilization History
---------------------------------------------
 91 (DMCA)   1% at   5:18:07 Mon Jun  4, 2018
 93 (ARP )  67% at   5:18:15 Mon Jun  4, 2018
 93 (ARP ) 100% at   5:18:16 Mon Jun  4, 2018
 93 (ARP ) 100% at  16:21:37 Tue Sep 18, 2018
---------------------------------------------

svl-bc-8332l100ay30-1#clear cpu       
CPU statistics cleared.
svl-bc-8332l100ay30-1#sh proc cpu hist

---------------------------------------------
CPU Utilization History
---------------------------------------------
 91 (DMCA)   1% at   5:18:07 Mon Jun  4, 2018
 93 (ARP )  67% at   5:18:15 Mon Jun  4, 2018
 93 (ARP ) 100% at   5:18:16 Mon Jun  4, 2018
 93 (ARP ) 100% at  16:21:37 Tue Sep 18, 2018
 93 (ARP ) 100% at  16:21:46 Tue Sep 18, 2018
---------------------------------------------

svl-bc-8332l100ay30-1#clear cpu       
CPU statistics cleared.
svl-bc-8332l100ay30-1#sh proc cpu hist

---------------------------------------------
CPU Utilization History
---------------------------------------------
 91 (DMCA)   1% at   5:18:07 Mon Jun  4, 2018
 93 (ARP )  67% at   5:18:15 Mon Jun  4, 2018
 93 (ARP ) 100% at   5:18:16 Mon Jun  4, 2018
 93 (ARP ) 100% at  16:21:37 Tue Sep 18, 2018
 93 (ARP ) 100% at  16:21:46 Tue Sep 18, 2018
 93 (ARP )  99% at  16:21:52 Tue Sep 18, 2018
 65 (ETMR) 100% at  16:21:53 Tue Sep 18, 2018
---------------------------------------------

svl-bc-8332l100ay30-1#

Lenovo Employee mslavin
Lenovo Employee
Posts: 153
Registered: ‎03-31-2015
Location: US
Views: 309
Message 2 of 5

Re: Weird results from "sh process cpu history" and "clear cpu"

Hello,

 

Can you share what version code you are running? Also, is there a specific goal you are looking to accompolish (some issue you are troubleshooting, or some infomration you are trying to gather for some purpose)? 

 

Thanks, Matt

Lenovo Technology Partner
Posts: 66
Registered: ‎04-29-2015
Location: US
Views: 304
Message 3 of 5

Re: Weird results from "sh process cpu history" and "clear cpu"

Software Version 7.7.27 (FLASH image2), active configuration.
Boot kernel version 7.7.27

 

This all started because a monitoring application (Whatsup) was reporting high cpu utilization on on a pair of switches.

 

We are trying to determine if there really is something on the switch causing very high utilization.

 

Lenovo Employee mmahboob
Lenovo Employee
Posts: 13
Registered: ‎05-08-2015
Location: US
Views: 282
Message 4 of 5

Re: Weird results from "sh process cpu history" and "clear cpu"

Hi ,

 

I see similar symtomps on my G8332 switch in the lab although all its ports are down except MGT port. so I am not sure if these statistics are accurate. see below output from the lab.

I have sent email to sustaining group to find out this behaviour and will get back to you once get update from them.

I can only tell you a better way to see the CPU utilization is using the command “show proc cpu” that has 1sec, 5sec, 1min and 5 min history.

 

 

asi8edc103_blue(config)#show clock            
13:37:44 Thu Nov 15, 2018

 

asi8edc103_blue#show proc cpu history

 

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

CPU Utilization History

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

96 (DONE)   8% at   8:23:21 Wed Sep 19, 2018

90 (DCSC)   1% at   8:23:31 Wed Sep 19, 2018

93 (ARP )  81% at   8:23:40 Wed Sep 19, 2018

93 (ARP ) 100% at   8:23:41 Wed Sep 19, 2018

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

 

asi8edc103_blue#clear cpu

CPU statistics cleared.

asi8edc103_blue#show proc cpu history

 

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

CPU Utilization History

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

96 (DONE)   8% at   8:23:21 Wed Sep 19, 2018

90 (DCSC)   1% at   8:23:31 Wed Sep 19, 2018

93 (ARP )  81% at   8:23:40 Wed Sep 19, 2018

93 (ARP ) 100% at   8:23:41 Wed Sep 19, 2018

93 (ARP ) 100% at  13:13:22 Thu Nov 15, 2018

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

 

asi8edc103_blue#clear cpu            

CPU statistics cleared.

asi8edc103_blue#show proc cpu history

 

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

CPU Utilization History

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

96 (DONE)   8% at   8:23:21 Wed Sep 19, 2018

90 (DCSC)   1% at   8:23:31 Wed Sep 19, 2018

93 (ARP )  81% at   8:23:40 Wed Sep 19, 2018

93 (ARP ) 100% at   8:23:41 Wed Sep 19, 2018

93 (ARP ) 100% at  13:13:22 Thu Nov 15, 2018

43 (LACP) 100% at  13:13:40 Thu Nov 15, 2018

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

 

asi8edc103_blue#clear cpu            

CPU statistics cleared.

asi8edc103_blue#show proc cpu history

 

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

CPU Utilization History

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

96 (DONE)   8% at   8:23:21 Wed Sep 19, 2018

90 (DCSC)   1% at   8:23:31 Wed Sep 19, 2018

93 (ARP )  81% at   8:23:40 Wed Sep 19, 2018

93 (ARP ) 100% at   8:23:41 Wed Sep 19, 2018

93 (ARP ) 100% at  13:13:22 Thu Nov 15, 2018

43 (LACP) 100% at  13:13:40 Thu Nov 15, 2018

42 (I2C ) 100% at  13:13:52 Thu Nov 15, 2018

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

 

Lenovo Technology Partner
Posts: 66
Registered: ‎04-29-2015
Location: US
Views: 235
Message 5 of 5

Re: Weird results from "sh process cpu history" and "clear cpu"

Right, and "sh proc cpu" shows no problem.

 

Interesting.

 

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