ADLINK aTCA-9700 - Manual (Page 53)

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Hyper-threading
This item allows you to enable or disable the Hyper-Threading technology. Options:
Enabled/Disabled.
Active Processor Core
This item allows you to select the number of cores to enable in each processor
package. This BIOS setting is present only when a multi-core processor is installed.
Limit CPUID Maximum
When the computer is booted up, the operating system executes CPUID instruction
to identify the processor and its capabilities. Before it can do so, it must first query
the processor to find out the highest input value CPUID recognizes. This determines
the kind of basic information CPUID can provide the operating system. This option
allows you to circumvent problems with older operating systems that do not support
Intel Pentium 4 processor with Hyper-Threading Technology.
When Enabled, the processor will limit the maximum CPUID input value to 03h when
queried, even if the processor supports a higher CPUID input value. When Disabled,
the processor will return the actual maximum CPUID input value of the processor
when queried. Options: Enabled/Disabled.
Execute Disable Bit
Intel’s Execute Disable Bit functionality can help prevent certain classes of malicious
buffer overflow attacks when combined with a supporting operating system. Execute
Disable Bit allows the processor to classify areas in memory by where application
code can execute and where it cannot. When a malicious worm attempts to insert
code in the buffer, the processor disables code execution and prevents damage and
worm propagation.
Hardware Prefetcher
This is used for reducing the waiting time of DRAM. The hardware prefetcher looks
for streams of data and tries to predict what data will be needed next by the
processor and proactively tries to fetch these data. Options: Enabled/Disabled.
Adjacent Cache Line Prefetch
It is opened for choose the optimal use of sequential memory access for performance
purpose. Disable this setting for the application that requires high use of random
memory access. Options: Enabled/Disabled.
DCU Streamer Prefetch
There are two distinct hardware prefetchers on aTCA-9700. Data Cache Unit (DCU)