Silicon Graphics Altix XE320, User Manual

Page: 146 / 248

118 007-5466-001
6: BIOS Settings
Execute Disable Bit
Set to Enabled to enable Execute Disable Bit and allow the processor to classify areas in memory
where an application code can be executed and where it cannot, and thus preventing a worm or a
virus from inserting and creating a flood of codes to overwhelm the processor or damage the
system during an attack. The options are Disabled and Enabled.
Adjacent Cache Line Prefetch
The CPU fetches the cache line for 64 bytes if this option is set to Disabled. The CPU fetches both
cache lines for 128 bytes as comprised if Enabled. The options are Disabled and Enabled.
Hardware Prefetch
Set this option to Enabled to enable the hardware components that are used in conjunction with
software programs to prefetch data in order to shorten execution cycles and maximize data
processing efficiency. The options are Disabled and Enabled.
Direct Cache Access
Set to Enable to route inbound network IO traffic directly into processor caches to reduce memory
latency and improve network performance. The options are Disabled and Enabled.
DCA Delay Clocks
This feature allows the user to set the clock delay setting from snoop to prefetch for Direct Cache
Access. Select a setting from 8 (bus cycles) to 120 (bus cycles) (in 8-cycle increment). The default
setting is 32 (bus cycles).
Intel Virtualization Technology
Select Enabled to use the Intel Virtualization Technology and enable one platform to run multiple
operating systems and applications in independent partitions, creating multiple “virtual” systems
in one physical computer. The options are Enabled and Disabled.
Note: If there is any change to this setting, you must power off and restart the system for the
change to take effect.