When my pages more small Nehalem for GST will kick?

Under some new hosts IBM HS22s (Nehalem L5530, 96 GB of RAM) with 4U1 ESXi and all updates.

Our old guests: Netburst CPU, ESX 3.5, run 25 VMs Windows, random sampling of the version of Windows and configuration, could get extreme savings from the GST: total Shared = ~ 25 GB, shared common = ~ 5 GB. Excessive punctures: gave 70 GB more than 64 actually existing. Due to the pooling, host is green healthy and happy around 50% usage.

In the new cluster running the same number of VMs, yet a similar random sampling of configurations, granted 92 gb of 96 GB physical host. Total shared: / 3 gb, shared pool: 2 GB. The host is alarming because of the use of the memory of 96%.

What I Mem.AllocGuestLargePage the value 0? I wish instead, it performs as I read here:


as server memory is close to fully committed, ESX switches to memory pages small so that GST can dedupe more effectively and end-users can then pack more VMs in the host.

Its going to be hard to explain why we lack the same workload at such a rate of use of management. It is true that we do not have performance issues and virtual machines are actually much more quickly.

Jesse, some information on why the host memory usage has increased. ESX4.0 supports EFA (material-mmu) on nehalems. Using large pages (2 MB) is especially benefitial for this case because of the cuts, you get in the treatment of TLB for young. The impact of some applications is as much as a 20% more performance. For this reason, ESX4.0 back aggressively client memory with 2 MB pages. This has two effects: reduction sharing page and memory allocation in coarser units. Both of these lead to increase in the use of the host memory and, as you note, this results in significant improvements in performance.

This behavior should not affect your ability to deploy virtual machines that you did before ESX4.0. If memory is to be rehabilitated, ESX4.0 will begin to drill 2M pages small pages allowing them to be shared (or if the pressure of memory is sufficient, inflated or exchanged). But it should not break large pages to do this and the result will be that GST will kick when it is advantageous to do so.

You ask if you set Mem.AllocGuestLargePage to 0. This will disable the use of large pages for your virtual machines. An alternative you should consider is to disable the alarm that signals the host high memory usage. Use of memory for better performance, knowing that it can be recovered if necessary seems preferable.

Tags: VMware

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