Oracle Linux: One CPU has 100% wait time on Server with QLogic FCoE card.
(Doc ID 2618956.1)
Last updated on OCTOBER 20, 2022
Applies to:
Linux OS - Version Oracle Linux 7.6 with Unbreakable Enterprise Kernel [4.14.35] and laterInformation in this document applies to any platform.
Symptoms
As per TOP command one CPU has 100% wait time:
top - 15:29:40 up 6:05, 1 user, load average: 2.15, 2.06, 2.02
Tasks: 260 total, 1 running, 136 sleeping, 0 stopped, 0 zombie
%Cpu0 : 0.4 us, 0.0 sy, 0.0 ni, 99.6 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu1 : 0.0 us, 0.0 sy, 0.0 ni, 0.0 id,100.0 wa, 0.0 hi, 0.0 si, 0.0 st <<<<<<<<<<<<< 100.0 wa
%Cpu2 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
%Cpu3 : 0.0 us, 0.0 sy, 0.0 ni,100.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
Also It can confirmed with MPSTAT command:
04:10:35 PM CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle
04:10:36 PM all 0.00 0.00 0.25 24.94 0.00 0.00 0.00 0.00 0.00 74.81
04:10:36 PM 0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00
04:10:36 PM 1 0.00 0.00 0.00 100.00 0.00 0.00 0.00 0.00 0.00 0.00 <<<<<<<<<<< 100.00 %iowait
04:10:36 PM 2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00
04:10:36 PM 3 0.00 0.00 0.99 0.00 0.00 0.00 0.00 0.00 0.00 99.01
Changes
Cause can be triggered for one of this reasons.
*) The core count was reduced.
*) There were installed a new kernel (UEK5 ).
*) A new QLogic FastLinQ FCoE card was installed.
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |