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OL: top/mpstat command may show steal time on some cpus during heavy network traffic
in Linux
Applies to:
Linux OS - Version Oracle Linux 8.0 and later
Symptoms:
Top or mpstat may show steal time on some cpus during heavy network traffic
%Cpu11 : 14.6 us, 52.5 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 5.8 si, 27.2 st
%Cpu12 : 70.1 us, 24.5 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.3 si, 5.2 st
%Cpu13 : 53.4 us, 30.9 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 15.7 st
Cause:
This is related to the vhost-net configuration, as the hypervisor will use parts of the cpu for its vhost-net process of such an instance.
Solution:
Use "Hardware-assisted (SR-IOV) networking" type, see
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