How to view IRQ, IO, and DMA devices in RedHatLinux

It is often asked how to check whether the IRQ, I/O, and DMA devices installed on the system conflict with each other in Linux. This document describes what is IRQ, I/O, DMA and how to view IRQ, I/O, and DMA of a device in Linux. IRQ (interruptrequestports) Requests CPU time through IRQ. devices on the machine, such as keyboards, monitors, and NICs, A total of 16 IRQ (0-15) machines that require the CPU to process requests from Intel are frequently asked by the system, in Linux, how does one check whether the IRQ, I/O, and DMA devices installed on the system conflict? What is IRQ, I/O, DMA and how to view IRQ, I/O, and DMA of a device in Linux.

IRQ (interrupt request ports)
Through IRQ, devices on the machine, such as keyboards, monitors, and NICs, can request CPU time and request the CPU to process requests.
A total of 16 IRQ (0-15) machines are occupied by the system. For the list, see

I/O address
I/O address is an address in the memory. It is used to provide storage areas for CPU and computer devices to exchange information.

DMA (Direct Memory Addresses)
Some computer devices, such as sound cards, have their own processors, so they do not need to be processed too much. They can directly access the memory through the DMA channel to improve efficiency. 8 DMA records (0-7)


How to view
View the corresponding file in the/proc directory to obtain the current device information.
/Proc/interrupts
/Proc/ioports
/Proc/dma
You can use commands such as cat, more, and less to view