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VM's %sys Gets to 50% or More for Extended Periods When Oversubscribed (Doc ID 2531735.1)

Last updated on FEBRUARY 26, 2020

Applies to:

Linux OS - Version Oracle Linux 6.10 with Unbreakable Enterprise Kernel [4.1.12] and later
Linux x86-64

Symptoms

VM shows %sy high as seen in Top:

Load average is in high and system calls in > 50

top - 09:48:56 up 15 days, 1:55, 0 users, load average: 164.59, 104.47, 61.60
Tasks: 11850 total, 140 running, 11710 sleeping, 0 stopped, 0 zombie
Cpu0 : 70.6%us, 16.9%sy, 0.0%ni, 0.1%id, 0.0%wa, 0.0%hi, 12.5%si, 0.0%st
Cpu1 : 72.4%us, 26.7%sy, 0.0%ni, 0.9%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu2 : 32.8%us, 64.8%sy, 0.0%ni, 0.3%id, 0.0%wa, 0.0%hi, 2.1%si, 0.1%st
Cpu3 : 40.7%us, 59.0%sy, 0.2%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu4 : 40.8%us, 57.9%sy, 0.5%ni, 0.8%id, 0.0%wa, 0.0%hi, 0.0%si, 0.1%st
Cpu5 : 36.5%us, 61.4%sy, 0.6%ni, 1.3%id, 0.0%wa, 0.0%hi, 0.1%si, 0.1%st
Cpu6 : 26.8%us, 71.8%sy, 1.1%ni, 0.2%id, 0.0%wa, 0.0%hi, 0.0%si, 0.1%st
Cpu7 : 20.4%us, 76.9%sy, 2.5%ni, 0.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu8 : 48.6%us, 51.1%sy, 0.1%ni, 0.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu9 : 60.7%us, 37.9%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 1.4%si, 0.0%st
Cpu10 : 17.1%us, 80.7%sy, 2.0%ni, 0.1%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu11 : 8.9%us, 90.4%sy, 0.7%ni, 0.1%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu12 : 71.4%us, 28.2%sy, 0.0%ni, 0.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.1%st
Cpu13 : 67.9%us, 26.6%sy, 0.0%ni, 1.9%id, 0.0%wa, 0.0%hi, 3.4%si, 0.1%st
Cpu14 : 20.5%us, 78.8%sy, 0.3%ni, 0.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.1%st
Cpu15 : 31.1%us, 64.4%sy, 0.6%ni, 0.8%id, 0.0%wa, 0.0%hi, 3.1%si, 0.1%st
Cpu16 : 45.9%us, 51.8%sy, 2.0%ni, 0.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu17 : 60.7%us, 35.3%sy, 0.6%ni, 1.3%id, 0.0%wa, 0.0%hi, 2.1%si, 0.1%st
Cpu18 : 33.9%us, 64.8%sy, 1.3%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Cpu19 : 46.7%us, 49.0%sy, 0.6%ni, 0.1%id, 0.0%wa, 0.0%hi, 3.7%si, 0.0%st
Cpu20 : 52.8%us, 46.9%sy, 0.0%ni, 0.1%id, 0.0%wa, 0.0%hi, 0.1%si, 0.1%st
Cpu21 : 59.1%us, 37.3%sy, 0.0%ni, 1.0%id, 0.0%wa, 0.0%hi, 2.5%si, 0.0%st

Changes

 VM is running under an Exadata environment where it was patched to 18.1.11 (kernel used after patching 4.1.12-94.8.6.el6uek.x86_64)

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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