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brogio
Contributor
Contributor

What is "zero MPN swap candidate" ?

Today, while SVmotioning a VM:

(...)

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=0

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=1

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=2

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=3

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=4

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=5

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=6

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=7

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=8

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=9

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=10

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=11

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=12

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=13

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=14

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=15

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=16

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=17

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=18

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=19

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=20

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=21

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=22

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=23

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=24

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=25

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=26

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=27

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=28

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=29

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=30

Feb 11 10:16:23 vmwareesx3 vmkernel: 4:22:36:55.422 cpu7:1861)Alloc: 13638: vm 1861: zero MPN swap candidate: mpn=0x401da, count=31

(...)

The Vm was correctly migrated.

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1 Reply
paul_xtravirt
Expert
Expert

MPN refers to "Machine Page Numbers" and is to do with Memory Resource Management. I would guess that you received a zero candidate message as nothing in memory needed to be remapped (e.g. moved).






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