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Memory states

Duncan Epping · Aug 17, 2010 ·

I was just browsing the vsinodes/procnodes. I noticed the following:

Free memory state thresholds {
soft:64 pct
hard:32 pct
low:16 pct
}

As explained in Frank’s excellent article on memory reservations, ESX/ESXi uses memory states to determine what type of memory reclamation technique to use. Techniques that can be used are TPS, ballooning and swapping. Of course you will always want to avoid ballooning and swapping but that is not the point here.  The point is that as far as I am aware the thresholds for those states have always been:

  • High – 6%
  • Soft – 4%
  • Hard – 2%
  • Low – 1%

This is also what our documentation states. Now if you do the math you will notice that 64% of 6% is indeed 4% and so on… Although it doesn’t seem to be substantial it is something I wanted to document, just for completeness sake.

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Server 4.1, ESX, esxi, vSphere

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Comments

  1. Chuck says

    19 August, 2010 at 20:08

    At which threshold are large pages broken into small pages for TPS?

    • Duncan Epping says

      29 January, 2011 at 08:55

      6%

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About the author

Duncan Epping is a Chief Technologist in the Office of CTO of the Cloud Platform BU at VMware. He is a VCDX (# 007) and the author of the "vSAN Deep Dive" and the “vSphere Clustering Technical Deep Dive” series.

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