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IMPORTANT ORDER OF PCI EXPRESS SLOTS
The PHYSICAL PCI Express Slots 1 – 7 are not in order when displayed in any Operating
Systems Device information.
3.5 Mapping Physical Slot locations to port locations using lspci
How do you locate your PCI Express Devices in our OSS Chassis? And how does that correspond to physical slot locations?
Below is an example of 7 PCI Express Downstream Ports in our OSS Chassis. This output comes from
lspci
–
vvv > info.txt
. It has been cleaned up
for this example. The OSS Chassis is located below under Bus 07. There are 7 downstream ports on Bus 8, each port has a number starting with
2, 4, … up to 14. The Bus number will change depending on the Server and location of host card. Each port is associated with a physical slot
number, 1 through 7. Ultimately, there is a SCSI card below located on port 8, port 8, corresponding to physical slot 2. Unfortunately, the SCSI
card results from lspci do not spell out
SLOT 2
, just
port 8
and that is why it is important to understand that a downstream port number is not
the same as a physical slot number. The Ethernet card is on port 14, corresponding to physical slot 7 in the chassis.
Example: lspci –vvv Output
07:00.0 PCI bridge: Integrated Device Technology, Inc. Unknown device 8037 (prog-if 00 [Normal decode])
Link: Supported Speed 5.0 Gb/s, Width x8, ASPM L0s L1,
Port 0
08:02.0 PCI bridge: Integrated Device Technology, Inc. Unknown device 8037 (prog-if 00 [Normal decode])
Link: Supported Speed 5.0 Gb/s, Width x8, ASPM L0s L1,
Port 2 Slot: Number 1
, PowerLimit 0.000000
08:04.0 PCI bridge: Integrated Device Technology, Inc. Unknown device 8037 (prog-if 00 [Normal decode])
Link: Supported Speed 5.0 Gb/s, Width x8, ASPM L0s L1,
Port 4
Slot: Numbe
r 4, PowerLimit 0.000000
08:06.0 PCI bridge: Integrated Device Technology, Inc. Unknown device 8037 (prog-if 00 [Normal decode])
Link: Supported Speed 5.0 Gb/s, Width x8, ASPM L0s L1,
Port 6
Slot: Number
5, PowerLimit 0.000000
08:08.0 PCI bridge: Integrated Device Technology, Inc. Unknown device 8037 (prog-if 00 [Normal decode])
Link: Supported Speed 5.0 Gb/s, Width x8, ASPM L0s L1,
Port 8 Slot: Number 2
, PowerLimit 0.000000
08:0a.0 PCI bridge: Integrated Device Technology, Inc. Unknown device 8037 (prog-if 00 [Normal decode])
Link: Supported Speed 5.0 Gb/s, Width x8, ASPM L0s L1,
Port 10 Slot: Number 3
, PowerLimit 0.000000
08:0c.0 PCI bridge: Integrated Device Technology, Inc. Unknown device 8037 (prog-if 00 [Normal decode])
Link: Supported Speed 5.0 Gb/s, Width x8, ASPM L0s L1,
Port 12
Slot: Number 6
, PowerLimit 0.000000
08:0e.0 PCI bridge: Integrated Device Technology, Inc. Unknown device 8037 (prog-if 00 [Normal decode])
Link: Supported Speed 5.0 Gb/s, Width x8, ASPM L0s L1,
Port 14
Slot: Number 7
, PowerLimit 0.000000
0c:00.0 SCSI storage controller: Triones Technologies, Inc. Unknown device 2310 (rev 02)
Link: Supported Speed 2.5Gb/s, Width x4, ASPM L0s,
Port 8
0f:00.0 Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet Controller (rev 06)
Link: Supported Speed 2.5Gb/s, Width x4, ASPM L0s L1,
Port 14