Data Sheet

Technologies
66 Datasheet, Volume 1 of 2
• The x2APIC extensions are made available to system software by enabling the local
x2APIC unit in the “x2APIC” mode. To benefit from x2APIC capabilities, a new
operating system and a new BIOS are both needed, with special support for x2APIC
mode.
• The x2APIC architecture provides backward compatibility to the xAPIC architecture
and forward extendible for future Intel platform innovations.
Note: Intel x2APIC Technology may not be available on all SKUs.
For more information, Refer the Intel
®
64 Architecture x2APIC Specification at http://
www.intel.com/products/processor/manuals/.
3.3.6 Power Aware Interrupt Routing (PAIR)
The processor includes enhanced power-performance technology that routes interrupts
to threads or processor IA cores based on their sleep states. As an example, for energy
savings, it routes the interrupt to the active processor IA cores without waking the
deep idle processor IA cores. For performance, it routes the interrupt to the idle (C1)
processor IA cores without interrupting the already heavily loaded processor IA cores.
This enhancement is mostly beneficial for high-interrupt scenarios like Gigabit LAN,
WLAN peripherals, and so on.
3.3.7 Intel
®
Transactional Synchronization Extensions
(Intel
®
TSX-NI)
Intel
®
Transactional Synchronization Extensions (Intel
®
TSX-NI) provides a set of
instruction set extensions that allow programmers to specify regions of code for
transactional synchronization. Programmers can use these extensions to achieve the
performance of fine-grain locking while actually programming using coarse-grain locks.
Details on Intel TSX-NI may be found in Intel
®
Architecture Instruction Set Extensions
Programming Reference.
Note: Intel TSX-NI may not be available on all SKUs.
3.4 Debug Technologies
3.4.1 Intel
®
Processor Trace
Intel
®
Processor Trace (Intel
®
PT) is a new tracing capability added to Intel
Architecture, for use in software debug and profiling. Intel
®
PT provides the capability
for more precise software control flow and timing information, with limited impact to
software execution. This provides enhanced ability to debug software crashes, hangs,
or other anomalies, as well as responsiveness and short-duration performance issues.
Intel
®
VTune™ Amplifier for Systems and the Intel System Debugger are part of Intel
System Studio 2015, which includes updates for new debug and trace features on this
latest platform, including Intel
®
PT and Intel Trace Hub.
§ §