Memory usage increased on ESXi 4.1 for ESX 4.0

Hi all

Recently, we migrated about 130 virtual machines to a Cluster of U2 ESX 4.0 to esxi 4.1 u1 cluster and noticed that the memory usage is very high on the hosts compared to 4.0.

The band u2 4.0 was 255GB of RAM between 9 guests and the new cluster has 355 GB of ram between 7 hosts.

use of the memory of the 4.0 u2 was about 60-70% and now on 4.1, on the use of 90%. Can someone please explain this. It is more difficult to understand that there are 100GB more RAM available on the new cluster, but its use all this.

ESX 4.0 host u2 were HP BL460 G1 - 32 GB each

ESXi 4.1 u1 are HP BL460 G6 - 48 GB each.

Thank you

According to me, IT ' was all about GST (Transparent Page Sharing) and your new generation of CPU. This phenomenon is independent of the version of vmkernel. Let me explain briefly,

New processor generation, such as Nehalem, have a feature called hardware support memory management unit, which includes a buffer cache called TLB (Translation Lookaside Buffer). I will not dive into the details but if vmkernel detects that your CPU have this kind of functionality, he decides to use pages (2 MB) memory instead of partial memory (4 KB) pages and also do not use GST as long as a restraint on resources of memory occurs. This is why you have a higher memory usage that you expect to see.

To work around the problem (not a best practice but it is necessary), you can force vmkernel to work with small pages and trigger the GST. There is an advanced for this setting.

  • Mem.AllocGuestLargePage= 0

You can try this on a test environment and see if it works for you.

Tags: VMware

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