Q-Logic 3100 User Manual

11–Troubleshooting Guidelines

Caveats

NE0154601-00  C

11-5

The QLogic adapter can be located on the PCI Express bus using the following 
Linux procedures. 



Determine the vendor and device ID. To check if the PCIe slot has a x8 
link for optimal PCIe performance, first determine the PCI vendor ID and 
device ID code by typing the following command:

You should see a message similar to:

06:00.0 0200: 4040:0100 (rev 42)

The QLogic vendor ID is 0x4040. A list of QLogic adapter device IDs is listed 
in 

.



Determine the interface attributes. To determine the attributes of the 
interface, type the following command:

You should see a message similar to:

Link: Supported Speed 2.5 Gb/s, Width x8, ASPM L0s, Port 0
Link: Speed 2.5Gb/s, Width x8



Determine the width parameters. Check if the 

lspci

 output “negotiated 

width” (the second width in the output) reflects the actual “supported width”. 
In an system with a QLE3044, for example, type the following command to 
determine if these two widths are the same:

In the previous command, 

4040

 indicates the QLogic vendor ID and 

0124

 

indicates a QLE3044. The device ID is 0126.

QLE3044

0124

Quad-port 1GbE copper interface

QLE3142-CU

0126

Dual-port 10GbE with twinax interface

QLE3142-SR

0126

Dual-port 10GbE with short-range fiber interface

QLE3142-LR

0126

Dual-port 10GbE with long-range fiber interface