Question about several popular vm with the same kernel version

So, I have been informed that ESX is smart enough for to run several virtual machines with the exact same kernel that it loads only one instance of the kernel in memory for all of them so that it saves space in RAM. This seems quite remarkable to me, and I'd like to see if VMWare has any white papers or other documents on this. I'd like to believe it's true, but it seems incredible to believe.

Is this really how ESX functions? If I have 10 XP SP3 machines with the same level and exact same version of the kernel patch, VMWware won't really load only one instance of the core XP in RAM to separate the 10 machines? If he does that, how handles when 10 machines all want access to the same statement in kernel mode at the same time separate?

Welcoem to the Forums - ESX will actually 10 instances of the core of the customer even if they are the same OS - but once loaded using Transparent Page Sharing the vmkernel (the o/s of the ESX Server) can recognize identical pages and store them a time-read only memory - if the virtual machine tries to write to that page a copy and writing is done - if this new page is another page in memory that one instance is maintained. This saves a TON of memory-

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Tags: VMware

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