Server, interrupted.

[dsr at tao.merseine.nu]

On Wed, Jan 26, 2005 at 02:28:21PM -0500, David Kramer wrote:
> On Wed, 26 Jan 2005, Gregory Boyce wrote:
> > Are you using IO-APIC on the machine?  An easy way to check 
> > /proc/interrupts and look for either "XT-PIC" or "IO-APIC".  Using the 
> > APIC can sometimes help with IRQ issues I believe.
> > 
> 
> [david at uni ~]$ cat /proc/interrupts
>            CPU0
>   0:   42051885          XT-PIC  timer
>   1:       6834          XT-PIC  keyboard
>   2:          0          XT-PIC  cascade
>   8:          2          XT-PIC  rtc
>   9:      95591          XT-PIC  acpi, DE450-TA (eth0), ehci_hcd, 
> usb-uhci, usb-uhci, usb-uhci
>  10:       1665          XT-PIC  eth1, ohci1394
>  11:    3526734          XT-PIC  EMU10K1, radeon at PCI:1:0:0
>  12:      56078          XT-PIC  PS/2 Mouse
>  14:     531629          XT-PIC  ide0
> NMI:          0
> LOC:          0
> ERR:        115
> MIS:          0
> 
> Never heard those terms before.  The limited STFW I could do at work
> indicates that those terms are associated with multiprocessor boxen, which 
> mine isn't.

           CPU0       CPU1       
  0:  481084576  487725791    IO-APIC-edge  timer
  1:      11705      10119    IO-APIC-edge  keyboard
  2:          0          0          XT-PIC  cascade
  4:      25679      17876    IO-APIC-edge  serial
  8:          4          0    IO-APIC-edge  rtc
  9:          0          0   IO-APIC-level  acpi
 14:   24118901   23759014    IO-APIC-edge  ide0
 15:    3887540    3916558    IO-APIC-edge  ide1
 16:          0          0   IO-APIC-level  usb-uhci
 18:          0          0   IO-APIC-level  usb-uhci
 19:          0          0   IO-APIC-level  usb-uhci
 24:   21904909   21553414   IO-APIC-level  ide2, ide3
 32:   17856807   17659950   IO-APIC-level  eth0
NMI:          0          0 
LOC:  968811046  968811044 
ERR:          0
MIS:       7958

>From a recent uniproc:

           CPU0       
  0:   27120934    IO-APIC-edge  timer
  1:          8    IO-APIC-edge  i8042
  4:          7    IO-APIC-edge  serial
  7:          2    IO-APIC-edge  parport0
  8:          4    IO-APIC-edge  rtc
  9:          0   IO-APIC-level  acpi
 14:   91315875    IO-APIC-edge  ide0
 15:         15    IO-APIC-edge  ide1
169:          0   IO-APIC-level  libata
177:          0   IO-APIC-level  ehci_hcd, uhci_hcd, uhci_hcd,
uhci_hcd, uhci_hcd
185:          0   IO-APIC-level  via82cxxx
193:  333098450   IO-APIC-level  eth0
NMI:          0 
LOC:   27418477 
ERR:          0
MIS:          0

Notice that IO-APIC gives you both level and edge-triggered
IRQs, and a whole lot more of them as a result.

-dsr-

-- 
Nothing to sig here, move along.