Product guide

QSSC-S4R Server System Product Guide Using the BIOS and utilities
Version 1.0
131
Setup Item Options
(Default in
Boldface)
Help Text Comments
effect.
Intel
®
Virtualization
Technology for Directed
I/O
Disabled
Enabled
Enable/Disable Intel
®
Virtualization
Technology for
Directed I/O(Intel
®
VT-d).
Report the I/O device assignment to VMM through DMAR
A
CPI Tables
Interrupt Remapping Disabled
Enabled
Enable/Disable Intel
®
VT-d Interrupt Remapping
support.
This option only appears when Intel
®
Virtualization Technology for Directed I/O
is enabled.
Coherency Support Disabled
Enabled
Enable/Disable Intel
®
VT-d Coherency support. This option only appears when Intel
®
Virtualization Technology for Directed I/O
is enabled.
A
TS Support Disabled
Enabled
Enable/Disable Intel
®
VT-d Address Translation
Services (ATS) support.
This option only appears when Intel
®
Virtualization Technology for Directed I/O
is enabled.
Pass-through DMA
Support
Disabled
Enabled
Enable/Disable Intel
®
VT-d Pass-through DMA support. This option only appears when Intel
®
Virtualization Technology for Directed I/O
is enabled.
Hardware Prefetcher Disabled
Enabled
Hardware Prefetcher is a speculative prefetch unit within
the processor(s).
Note: Modifying this setting may affect system
performance.
A
djacent 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)
Disabled
Enabled
A
llows processors to increase the I/O performance by
placing data from I/O devices directly into the processor
cache.
NMI on Fatal Errors Disabled
Enabled
When enabled, causes NMI to be the preferred mode of
halting OS instead of the default Machine Check mode