Red Hat LINUX 7.2 Reference Manual page 67

Section 4.2:Top-Level Files in /proc
1: 339
2:
5: 80111
8:
12: 6107
14: 60324
15: 541741
NMI:
ERR:
For a multi-processor machine, this file may look slightly different:
CPU0
0: 1366814704
1: 128
2:
8:
12: 5323
13:
16: 11184294
20: 8450043
30: 10432
31: 23
NMI:
ERR:
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 tells you 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 a little
different. For x86 machines, the following values are common:
• XT-PIC — The old AT computer interrupts that have been around for a long time.
• 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 the
IO-APIC-level interrupt, are only seen on systems with processors from the 586 family and
higher.
• IO-APIC-level — Generates interrupts when its voltage signal goes high until the signal goes
low again.
4.2.10 /proc/iomem
This file shows you the current map of the system's memory for its various devices:
XT-PIC
0 XT-PIC
XT-PIC
1 XT-PIC
XT-PIC
XT-PIC
XT-PIC
0
0
CPU1
0
340 IO-APIC-edge
0 0
0 1 IO-APIC-edge
5793 IO-APIC-edge
1 0
15940594 IO-APIC-level
11120093 IO-APIC-level
10722 IO-APIC-level
22 IO-APIC-level
0
0
keyboard
cascade
usb-uhci, eth0
rtc
PS/2 Mouse
ide0
ide1
XT-PIC timer
keyboard
XT-PIC cascade
rtc
PS/2 Mouse
XT-PIC fpu
Intel EtherExpress Pro 10/100 Ethernet
megaraid
aic7xxx
aic7xxx
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