Can I disable on host large Pages If the Application does not support them?

Guys,

Ive read any literature on the management of resources, but unfortuntaly can't really get my head around a rather popular issue.

"Should I turn off large pages with the Mem.AllocGuestLargePage parameter?

My workload is 90% JBOSS Application servers running x 64 JBOSS/Java on windows 2008r2 clients

in this environment, each guest has 4 GB of memory, but the workload on each machine is extremely similar, the kind of situation where you expect massive savings in memory caused by the GST. Infact ESXTOP watch 3800 + figures for COWH on these hosts.

Now I know 2008R2 Server supports large pages, but I'm sure that JBOSS for Winodws only (and even if it did, its not currently enabled). Yes, am I right in thinking that, because my application does not make use of large pages, I will suffer any decline in performance by changing this setting? and even if I did it would be negligible? Or the fact that the guest operating system IE 2008R2 this is supported at the level of the BONE and the parameters memory application are irrelevant?

Guests are R815s from Dell, 128 GB, 4 x proc 12core AMD jobs and even sheer theyre only hit 20% CPU while I am getting memory host warnings use in vCenter to 90% + use of memory (shared common = 95 MB!)

If I remember well virtualizationis DMA actually disabled in bios R815, given that there seems to also be a bug where it randomly will not be so active pushing, even to the installer! I read about this on google, and trying to activate on the host has experienced the same problem as others while he is now off. Same IM not sure that this is and if its at all associated, but thought it was worth mentioning.

Any help most appreciated and if any cancelation I did try and learn more about this with some research first etc. before asking

Helps to have a reading of article André recent on the topic (published today), admitted that she, he is destined to VDI workloads, tho ' can help you in your search...

http://myvirtualcloud.NET/?p=1797

Tags: VMware

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