Supero SUPERSERVER 5018A-MLTN4 User Manual page 93

Chapter 7: BIOS
Package C State limit
Select Auto for the AMI BIOS to automatically set the limit on the C-State packag-
ing register. The options are No Limit, C1 state, C2 state, C3 state, C4 state, and
C6 (non Retention) state.
Enhanced Halt State (C1E)
Select Enabled for "Enhanced Halt State" (C1E) support, which will significantly
reduce the CPU's power consumption by reducing the CPU's clock cycle and volt-
age during a Halt State. The options are Disabled and Enabled.
Monitor/Mwait
If this feature is set to Enabled, the processor will carry out the "Monitor/Mwait"
instruction by specifying an address on which to wait (Monitor) and giving an instruc-
tion to start the "wait operation" (Mwait). The options are Disabled and Enabled.
L1 Prefetcher (Available when supported by the CPU)
If set to Enabled, the L1 cache prefetcher will prefetch streams of data and instruc-
tions from the main memory to the L1 cache to improve CPU performance. The
options are Disabled and Enabled.
L2 Prefetcher (Available when supported by the CPU)
If set to Enabled, the L2 cache prefetcher will prefetch streams of data and instruc-
tions from the L1 cache to the L2 cache to improve CPU performance. The options
are Disabled and Enabled.
ACPI 3.0 T-States (Available when supported by the CPU)
Select Enabled to support Advanced Configuration and Power Interface (ACPI)
3.0 T-States, which will allow the CPU driver to receive _TPC change notifications
for CPU speed control to improve system cooling. The options are Enabled and
Disabled.
Max CPUID Limit
Select Enabled to set the maximum CPU ID value and to boot the legacy operat-
ing systems that cannot support processors with extended CPUID functions. The
options are Enabled and Disabled (for the Windows OS).
Execute-Disable Bit (Available if supported by the OS & the CPU)
Set to Enabled to provide Execute Disable Bit support which will allow the processor
to designate areas in the system memory where an application code can execute
and where it cannot, thus preventing a worm or a virus from flooding illegal codes
to overwhelm the processor or damage the system during an attack. The default is
Enabled. (Refer to Intel and Microsoft Web Sites for more information.)
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