6.5.1

Table Of Contents
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Verify that Intel Nehalem Generation (Xeon Core i7) or later processors or AMD Opteron Generation
3 ("Greyhound") or later processors are installed.
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Verify that Intel VT-x or AMD-V is enabled in the BIOS so that hardware-assisted virtualization is
possible.
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Required Privileges: Virtual machine.Configuration.Settings is set on the vCenter Server system.
Procedure
1 Right-click a virtual machine in the inventory and select Edit Settings.
2 On the Virtual Hardware tab, expand CPU and enable virtualized CPU performance counters.
3 Click OK.
Change CPU/MMU Virtualization Settings
ESXi can determine whether a virtual machine needs hardware support for virtualization. ESXi makes this
determination based on the processor type and the virtual machine. Overriding the automatic selection
can provide better performance for some use cases.
You can use software MMU when your virtual machine runs heavy workloads, such as Translation
Lookaside Buffers (TLBs) intensive workloads that have significant impact on the overall system
performance. However, software MMU has a higher overhead memory requirement than hardware MMU.
So, to support software MMU, the maximum overhead supported for virtual machine limit in the VMkernel
needs to be increased. You can configure your virtual machine with up to 128 CPUs if your virtual
machine host has ESXi 6.0 and later compatibility (hardware version 11).
Note To take advantage of all features that virtual hardware version 13 provides, use the default
hardware MMU setting.
Procedure
1 Right-click a virtual machine in the inventory and select Edit Settings.
2 On the Virtual Hardware tab, expand CPU, and select an instruction set from the CPU/MMU
Virtualization drop-down menu.
3 Click OK.
Virtual Memory Configuration
You can add, change, or configure virtual machine memory resources or options to enhance virtual
machine performance. You can set most of the memory parameters during virtual machine creation or
after the guest operating system is installed. Some actions require that you power off the virtual machine
before changing the settings.
vSphere Virtual Machine Administration
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