Reservations and their effect on memory in 4.1

All the:

I read up on top of the excellent series of Frank Denneman on oversized VM and their impact.  I started to read more in-depth VMware documentation on it, and I came up with a question that I can't find the answer to yet.  Maybe someone here knows the answer.

If I have a Windows VM with a large reserve, given that the zeros the memory at startup of Windows, it will take the entire booking at the front.  My question is how does the GST and zero-page effect sharing only the affected memory?  I understand that once a machine has been attributed to his full booking, that memory will not be inflated, but these other features will reduce the impact on the memory of my physics?

Thank you!


Brandon

Hey Bradon,

Thanks for the add-in.

Online reviews:

If I have a Windows VM with a large reserve, given that the zeros the memory at startup of Windows, it will take the entire booking at the front.

Good thing to know is that reserved memory is not equal to the memory allocated in all cases. If a page is shared between two vm of the allocated space is 0.5 pages, but the two or a single virtual machine will have a dedicated page.

Yes, it will reduce the amount of memory without reserve in the host\cluster. Unreserved memory is used by CAC to determine if it can market a virtual machine with a reserve of memory. It has nothing to do with active memory real or affected memory.

My question is how does the GST and zero-page effect sharing only the affected memory?

Normally, GST will collapse and share each identical to the host page. Unfortunately, if the virtual machine uses HW MMU (because of IVR AMD and Intel EPT) the VMkernel uses large pages. A great page (2 MB) is not shared by TPS. vSphere 4.1 uses zero page sharing, Duncan will display a very interesting post soon on zero page Thunder, so I don't want to steal the Thunder.

Small pages supported by large pages have precomputed tips for GST, so in case of real memory contention (less than 6% of free memory space of the host) the VMkernel might Exchange pages. But the VMkernel has a share before the swap and a compress before the exchange policy. If ESX breaks the large page and subsequently share all the same pages using precomputed indicators before they are swapped.

Because of this policy, sound very likey see page very little share in vSphere 4.1 on systems using IVR AMD or Intel EPT when the memory of the host is under committed themselves. Only when memory pressure is reached, mass page sharing occurs. Contrary to popular belief, the ability of reclaimation of memory page sharing in esx is not diminished, it's just postponed until free memory is really low.

I understand that once a machine has been attributed to his full booking, that memory will not be inflated, but these other features will reduce the impact on my physical memory

Correct, and that's exactly what you want. A reserve is a warranty of physical resources, if the system knows the claim or not.

Please read http://frankdenneman.nl/2009/12/impact-of-memory-reservation/ for more information on memory reservations.

Tags: VMware

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