Introduction
This document discuss about the High CPU Utilization on Nexus 5010 and related bug information.
Core Issue
High CPU Utilization on Nexus 5010
Resolution
Intermittent High CPU spikes observed under the show process CPU history is expected normal activity on Cisco Nexus 5000 switch. This brief High CPU utilization could be caused by platform processes and does not affect the normal functioning of the switch.
Using the show process cpu history command on a switch with little traffic would show the following:
switch# show processes cpu history
211122112323122212111111111193211112111152112221112222122112
068760965840725240962130210254094430654360576635870512734431
100 #
90 #
80 #
70 #
60 # #
50 # #
40 # # #
30 # ## # # ## # ## #
20 ################ ### #### ### ################# #
10 ############################################################
0....5....1....1....2....2....3....3....4....4....5....5....
0 5 0 5 0 5 0 5 0 5
CPU% per second (last 60 seconds)
# = average CPU%
1 1 1 1 1 1 1
906557580987095557477660850989669699968987795968078578509685
500168220197069036851800640710741407559320077351025190708567
100 ** * ** * ** ** * * **
90 ** *** ** ** ** * * *** ** * * * * ** *
80 ** * ******* * * ** **** * *** *** * * ** * ** ** *
70 ** * ******* * *** ** ***** * ********** ****** ** ****
60 *** ** ******** * ****** ************************* ********
50 ************************************************************
40 ************************************************************
30 *******************************************************#****
20 ############################################################
10 ############################################################
0....5....1....1....2....2....3....3....4....4....5....5....
0 5 0 5 0 5 0 5 0 5
CPU% per minute (last 60 minutes)
* = maximum CPU% # = average CPU%
323322422222554232222224422225225222222232333522222432225555222222222342
046933526726792664338535533350361672443333087873334873290257433572422603
100
90
80
70
60 ** * **
50 * ** ** * * * * ****
40 ** * *** * ** * * *** ** **** **
30 * ** * ** ****** ** ** ** **** * ***** ** ***** ** **
20 ########################################################################
10 ########################################################################
0....5....1....1....2....2....3....3....4....4....5....5....6....6....7.
0 5 0 5 0 5 0 5 0 5 0 5 0
CPU% per hour (last 72 hours)
* = maximum CPU% # = average CPU%
Using the show processes cpu sort command, you might see CPU utilization spikes caused by platform processes.
switch# show processes cpu sort | exc 0.0
PID Runtime(ms) Invoked uSecs 1Sec Process
----- ----------- -------- ----- ------ -----------
4425 2488 4460919 0 23.5% statsclient
4296 2343 7178248 0 17.6% pfma
4404 40 71615766 0 2.0% gatosusd
CPU util : 13.9% user, 23.8% kernel, 62.4% idle
switch#
This activity is normal for the switch and does not affect traffic because all traffic is switched by hardware ASICs and not by the CPU. Therefore intermittent high CPU observed in Nexus 5000 is expected and does not affect the normal functioning of the switch. However, the high CPU utilization could also be related to any of the following bugs.
Related Bug Information
For detailed information on the following bugs refer to Bug Toolkit
CSCte81951 -The command show system resources shows incorrect CPU Utilization.
CSCth19083 - Nexus 5000 integrated with a DCNM server, shows High CPU from the SSH process.
CSCto47633 -Nexus 5000shows high CPU in wwn_manager when FCOE is enabled.
CSCtd04122 -Nexus 5000 reports high CPU via SNMP.
CSCth08102 - The command show system resources shows "nan% user" instead of valid numbers
CSCtq05808 - Nexus 5000 reports high CPU utilization due to vlan manager and snmpd processes
Related Information
Cisco Nexus 5000 Troubleshooting Guide
