System information

38 System Analysis and Tuning Guide
sw irq: 1:15:35.25 0.4% swap in : 69
idle : 9d 16:07:56.79 73.8% swap out: 209
uptime: 6d 13:07:11.14 context : 542720687
irq 0: 141399308 timer irq 14: 5074312 ide0
irq 1: 73784 i8042 irq 50: 1938076 uhci_hcd:usb1, ehci_
irq 4: 2 irq 58: 0 uhci_hcd:usb2
irq 6: 5 floppy [2] irq 66: 872711 uhci_hcd:usb3, HDA I
irq 7: 2 irq 74: 15 uhci_hcd:usb4
irq 8: 0 rtc irq 82: 178717720 0 PCI-MSI e
irq 9: 0 acpi irq169: 44352794 nvidia
irq 12: 3 irq233: 8209068 0 PCI-MSI l
To see all the information, use the parameter -a. The parameter -nN produces up-
dates of the information every N seconds. In this case, terminate the program by
pressing q.
By default, the cumulative values are displayed. The parameter -d produces the dif-
ferential values. procinfo -dn5 displays the values that have changed in the last
five seconds:
2.6.2 System Control Parameters: /proc/
sys/
System control parameters are used to modify the Linux kernel parameters at runtime.
They can be checked with the sysctl command, or by looking into /proc/sys/.
A brief description of some of /proc/sys/'s subdirectories follows.
/proc/sys/vm/
Entries in this path relate to information about the virtual memory, swapping, and
caching.
/proc/sys/kernel/
Entries in this path represent information about the task scheduler, system shared
memory, and other kernel-related parameters.
/proc/sys/fs/
Entries in this path relate to used file handles, quotas, and other file system-ori-
ented parameters.
/proc/sys/net/
Entries in this path relate to information about network bridges, and general net-
work parameters (mainly the ipv4/ subdirectory).