[PCA] High %steal Time on Hot-added VCPU (Doc ID 2553256.1)

Last updated on NOVEMBER 09, 2019

Applies to:

Symptoms

Newly hot-added vcpu's show 100% steal time on the guestVM

zzz ***Thu Oct 11 14:37:42 CEST 2018
Linux 4.1.12-124.14.1.el7uek.x86_64 (gille-test) 10/11/18 _x86_64_ (4 CPU)

14:37:42 CPU %usr %nice %sys %iowait %irq %soft %steal %guest %gnice %idle
14:37:43 all 0.00 0.00 0.00 0.00 0.00 0.00 100.00 0.00 0.00 0.00
14:37:43 0 1.01 0.00 1.01 0.00 0.00 0.00 0.00 0.00 0.00 97.98
14:37:43 1 1.00 0.00 1.00 0.00 0.00 0.00 0.00 0.00 0.00 98.00
14:37:43 2 0.00 0.00 0.00 0.00 0.00 0.00 100.00 0.00 0.00 0.00
14:37:43 3 0.00 0.00 0.00 0.00 0.00 0.00 100.00 0.00 0.00 0.00

Before hot-add vcpu 

$ cat /proc/stat
cpu 16001 156 47245 362756786 974626 2 673 583016462099 0 0
cpu0 7949 71 34200 181754797 552 0 564 112092 0 0
cpu1 8049 84 13041 180863345 974073 2 109 42449 0 0

After hot-add two additional cpu's, notice the bogus steal value for cpu2 and cpu3 

$ cat /proc/stat
cpu 17826 156 48225 362680727 975016 2 674 1540364971121 0 0
cpu0 9260 71 34709 181775769 647 0 564 112112 0 0
cpu1 8564 84 13512 180884978 974332 2 109 42462 0 0
cpu2 0 0 1 10008 16 0 0 894397586966 0 0
cpu3 1 0 1 9971 19 0 0 645967229580 0 0

Cause

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