Ioh24D Pci Express; Table 6. Ioh24D Pci Express* Bus Segments - Intel S5500WB Technical Product Specification

Intel® Server Board S5500WB TPS
• Manageability Engine (ME) subsystem
3.5.1

IOH24D PCI Express*

PCI Express* Gen1 and Gen2 are dual-simplex, point-to point serial differential low-voltage
interconnects. The signaling bit rate is 2.5 Gb/s one direction per lane for Gen1 and 5.0 Gb/s
one direction per lane for Gen2. Each port consists of a transmitter and receiver pair. A link
between the ports of two devices is a collection of lanes (x1, x2, x4, x8, x16, and so forth). All
lanes within a port must transmit data using the same frequency. The following table lists the
usage of the IOH24D PCI Express* bus segments.
PCI Bus Segment Width
Port 0 x4
ICH10R
PE1, PE2 x4
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Intel 5500 Chipset
IOH PCI Express*
PE3, X4
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Intel 5500 Chipset
IOH PCI Express*
PE7, PE8 x8
®
Intel 5500 Chipset
IOH PCI Express*
PE9, PE10 x8
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Intel 5500 Chipset
IOH PCI Express*
3.5.1.1 Direct Cache Access (DCA)
The DCA mechanism is a system-level protocol in a multi-processor system to improve I/O
network performance by providing higher system performance. It is designed to minimize cache
misses when a demand read is executed. This is accomplished by placing the data from the I/O
devices directly into the CPU cache through hints to the processor to perform a data pre-fetch
and install it in its local caches. The Intel
(DCA). You enable or disable DCA in the BIOS processor setup menu.
3.5.1.2 Intel Virtualization Technology for Directed I/O (Intel
®
®
The Intel Virtualization Technology is designed to support multiple software environments
sharing the same hardware resources. Each software environment may consist of an operating
system and applications. You can enable or disable the Intel
BIOS setup. The default behavior is disabled.
Note: If the setup options are changed to enable or disable the Virtualization Technology setting
in the processor, the user must perform an AC power cycle for the changes to take effect.
Revision 1.3

Table 6. IOH24D PCI Express* Bus Segments

Speed Type
10 Gb/s PCI Express*
Gen1
10 Gb/s PCI Express*
Gen1
20 Gb/S PCI Express*
Gen2
40 Gb/S PCI Express*
Gen2
40 Gb/S PCI Express*
Gen2
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5500 series processor supports Direct Cache Access
Intel order number E53971-004
PCI I/O Card Slots
x4 PCI Express* Gen1 throughput to the ICH10R
southbridge
x4 PCI Express* Gen1 throughput to an onboard NIC.
X4 PCI Express* Gen2 throughput to slot 1.
x8 PCI Express* Gen2 throughput to the slot 6 riser .
x4 PCI Express* Gen2 throughput to each of the two Intel
I/O Expansion Module connectors.
VT-d)
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®
Virtualization Technology in the
Functional Architecture
27
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