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- - Apic (http://justlinux.com/forum/showthread.php?t=142000)

zugwrack

08-11-2005 12:44 PM

Apic

Ok so why is it some distros require you to add this as a boot option, while others do not? What is APIC and how does it make hardware work better/more efficiently etc.?

Hayl	08-11-2005 02:53 PM

well, you can turn it on or off with the boot option depending on if they have or not in their kernel. people who make their own kernel can control whether or not it is in there when they choose their options.

it is Advanced Programmable Interrupt Controller, if you go to wikipedia.org they have a full definition of what it does.

bwkaz

08-11-2005 07:19 PM

But in a nutshell: You get 31 IRQs instead of 15. ;)

Code:

$ cat /proc/interrupts

           CPU0       

  0:   30963607    IO-APIC-edge  timer

  1:      16989    IO-APIC-edge  i8042

  8:          0    IO-APIC-edge  rtc

  9:          0   IO-APIC-level  acpi

 14:      31353    IO-APIC-edge  ide0

 15:         14    IO-APIC-edge  ide1

 16:    1502871   IO-APIC-level  YMFPCI, nvidia

 18:     647913   IO-APIC-level  bttv0, btaudio

 21:     136923   IO-APIC-level  uhci_hcd, uhci_hcd, uhci_hcd, ehci_hcd

 23:      29569   IO-APIC-level  eth0

NMI:          0 

LOC:   30963545 

ERR:          0

MIS:          0

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