VMware vSphere 4 Technical Information download pdf (Page 15)

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Chapter 1 Hardware for Use with VMware vSphere

Hardware BIOS Settings

The default hardware BIOS settings on servers might not always be the best choice for optimal performance.

This section lists some of the BIOS settings you might want to check.

 Make sure you are running the latest version of the BIOS available for your system.

 Make sure the BIOS is set to enable all populated sockets, and enable all cores in each socket.

 Enable “Turbo Mode” if your processors support it.

 Make sure hyper-threading is enabled in the BIOS.

 Some NUMA-capable systems provide an option to disable NUMA by enabling node interleaving. In

most cases you will get the best performance by disabling node interleaving.

 Make sure any hardware-assisted virtualization features (VT-x, AMD-V, EPT, RVI) are enabled in the

BIOS.

 Disable C1E halt state in the BIOS. (See note above regarding performance considerations versus power

considerations.)

 Disable any other power-saving mode in the BIOS. (See note above regarding performance considerations

versus power considerations.)

 Disable any unneeded devices from the BIOS, such as serial and USB ports.

OTE ESX 4.0 supports Enhanced Intel SpeedStep

and Enhanced AMD PowerNow!

™

CPU power

management technologies that can save power when a host is not fully utilized. However because these and

other power-saving technologies can reduce performance in some situations, you should consider disabling

them when performance considerations outweigh power considerations.

OTE Because of the large number of different server models and configurations, any list of BIOS options is

always likely to be incomplete.

OTE After updating the BIOS, you may need to make sure your BIOS settings are still as you wish.

OTE After these changes are made some systems may need a complete power down before the changes

take effect. See http://communities.vmware.com/docs/DOC-8978 for details.

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VMware vSphere 4 Technical Information Page 15