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unusual order of '/proc/cpuinfo' on Sun Fire X5-4 (Doc ID 2245534.1)

Last updated on AUGUST 04, 2018

Applies to:

Linux OS - Version Oracle Linux 7.0 and later
Information in this document applies to any platform.

Symptoms

 Numbering of core ids per physical id is other than expected:
0,1,10,11,16,17,18,19,2,20,24,25,26,27,3,4,8,9
This is an unusual order for counting and also also expecting sequence 0-17 instead of 0-27 with gaps.

# egrep -e "core id" -e ^physical /proc/cpuinfo|xargs -l2 echo|sort -u
physical id : 0 core id : 0
physical id : 0 core id : 1
physical id : 0 core id : 10
physical id : 0 core id : 11
physical id : 0 core id : 16
physical id : 0 core id : 17
physical id : 0 core id : 18
physical id : 0 core id : 19
physical id : 0 core id : 2
physical id : 0 core id : 20
physical id : 0 core id : 24
physical id : 0 core id : 25
physical id : 0 core id : 26
physical id : 0 core id : 27
physical id : 0 core id : 3
physical id : 0 core id : 4
physical id : 0 core id : 8
physical id : 0 core id : 9
physical id : 1 core id : 0
physical id : 1 core id : 1
physical id : 1 core id : 10
physical id : 1 core id : 11
physical id : 1 core id : 16
physical id : 1 core id : 17
physical id : 1 core id : 18
physical id : 1 core id : 19
physical id : 1 core id : 2
physical id : 1 core id : 20
physical id : 1 core id : 24
physical id : 1 core id : 25
physical id : 1 core id : 26
physical id : 1 core id : 27
physical id : 1 core id : 3
physical id : 1 core id : 4
physical id : 1 core id : 8
physical id : 1 core id : 9
physical id : 2 core id : 0
physical id : 2 core id : 1
physical id : 2 core id : 10
physical id : 2 core id : 11
physical id : 2 core id : 16
physical id : 2 core id : 17
physical id : 2 core id : 18
physical id : 2 core id : 19
physical id : 2 core id : 2
physical id : 2 core id : 20
physical id : 2 core id : 24
physical id : 2 core id : 25
physical id : 2 core id : 26
physical id : 2 core id : 27
physical id : 2 core id : 3
physical id : 2 core id : 4
physical id : 2 core id : 8
physical id : 2 core id : 9
physical id : 3 core id : 0
physical id : 3 core id : 1
physical id : 3 core id : 10
physical id : 3 core id : 11
physical id : 3 core id : 16
physical id : 3 core id : 17
physical id : 3 core id : 18
physical id : 3 core id : 19
physical id : 3 core id : 2
physical id : 3 core id : 20
physical id : 3 core id : 24
physical id : 3 core id : 25
physical id : 3 core id : 26
physical id : 3 core id : 27
physical id : 3 core id : 3
physical id : 3 core id : 4
physical id : 3 core id : 8
physical id : 3 core id : 9

 

Cause

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In this Document
Symptoms
Cause
Solution
References


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