Best Practices When Deploying Linux on the HP ProLiant DL980 (updated December 2012)

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Figure 6: Disabling Hyper-Threading (HT) using RBSU
For more information about HP’s RBSU, see the HP ROM-Based Setup Utility User Guide:
www.hp.com/support/rbsu
Disable x2APIC with Intel Xeon E-7 series processors
As noted in the “OS support matrix for the HP ProLiant DL980 server” section on page 11, Red Hat Enterprise Linux 5.X
and SUSE Linux Enterprise Server 10 do not support the Intel x2 Advanced Programmable Interrupt Controller (x2APIC)
architecture. Systems with Intel Xeon E-7 series processors (Westmere) require disablement of x2APIC support prior to
the installation. By default, x2APIC is disabled on the DL980.
x2APIC support is controlled by the system BIOS. To access the x2APIC settings and verify disablement, follow these
steps:
1. During system boot, press F9 to run the ROM-Based Setup Utility (RBSU).
2. Select Advanced Options.
3. Select Advanced System ROM Options.
4. Select x2APIC (see Figure 7).
5. If necessary, select Disabled to turn x2APIC OFF.
6. Exit all RBSU menu screens using the Esc key.
7. Press the F10 key to confirm your changes and reboot the system.