Intel® Server Boards S5520HC, S5500HCV, and S5520HCT TPS BIOS Setup Utility
Revision 1.8
Intel order number E39529-013
81
Setup Item Options Help Text
Comments
Intel
Virtualization
Technology for Directed
I/O
Enabled
Disabled
Enable/Disable Intel
Virtualization
Technology for Directed I/O.
Report the I/O device assignment to VMM
through DMAR ACPI Tables
Interrupt Remapping
Enabled
Disabled
Enable/Disable Intel
VT-d Interrupt
Remapping support.
Only appears when Intel
Virtualization Technology for
Directed I/O is enabled.
Coherency Support
Enabled
Disabled
Enable/Disable Intel
VT-d Coherency
support.
Only appears when Intel
Virtualization Technology for
Directed I/O is enabled.
ATS Support
Enabled
Disabled
Enable/Disable Intel
VT-d Address
Translation Services (ATS) support.
Only appears when Intel
Virtualization Technology for
Directed I/O is enabled.
Pass-through DMA
Support
Enabled
Disabled
Enable/Disable Intel
VT-d Pass-through
DMA support.
Only appears when Intel
Virtualization Technology for
Directed I/O is enabled.
Hardware Prefetcher
Enabled
Disabled
Hardware Prefetcher is a speculative
prefetch unit within the processor(s).
Note: Modifying this setting may affect
system performance.
Adjacent Cache Line
Prefetch
Enabled
Disabled
[Enabled] - Cache lines are fetched in pairs
(even line + odd line).
[Disabled] - Only the current cache line
required is fetched.
Note: Modifying this setting may affect
system performance.
Direct Cache Access
(DCA)
Enabled
Disabled
Allows processors to increase the I/O
performance by placing data from I/O
devices directly into the processor cache.
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