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5.2.11. /proc/interrupts
This file records the number of interrupts per IRQ on the x86 architecture. A standard
/proc/interrupts looks similar to the following:
For a multi-processor machine, this file may look slightly different:
The first column refers to the IRQ number. Each CPU in the system has its own column and its own number of interrupts per IRQ. The next column reports the type of interrupt, and the last column contains the name of the device that is located at that IRQ.
Each of the types of interrupts seen in this file, which are architecture-specific, mean something different. For x86 machines, the following values are common:
XT-PIC— This is the old AT computer interrupts.IO-APIC-edge— The voltage signal on this interrupt transitions from low to high, creating an edge, where the interrupt occurs and is only signaled once. This kind of interrupt, as well as theIO-APIC-levelinterrupt, are only seen on systems with processors from the 586 family and higher.IO-APIC-level— Generates interrupts when its voltage signal is high until the signal is low again.
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