High interrupt CPU usage in top

[Mark Cullen]

Simon 'corecode' Schubert wrote:
On 07.06.2006, at 16:41, Mark Cullen wrote:

I don't know if it is anything to be concerned about, but I seem to be 
seeing high interrupt CPU usage in top (at least) when compiling 
things...


ha!  i reported the same, but never found out the reason.  which 
hardware (exactly) do you use?

cheers
  simon
Interesting  :-)  Well I am glad I am not the only one then at least.

It's on a rather old box, uhm...

Gigabyte GA6BXE
Celeron (don't laugh!) 1GHz
2 x 100Mb Intel NICs (EtherExpress 100?)
ATi Rage Pro 128
Some good old PC100 RAM
Old Fujitsu 10GB hard disk of some description :-)
Perhaps dmesg and pciconf output is more helpful?

Copyright (c) 2003, 2004, 2005, 2006 The DragonFly Project.
Copyright (c) 1992-2003 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
DragonFly 1.4.4-RELEASE #1: Sat Apr 22 10:46:47 PDT 2006
    root@:/home/usr.obj/usr/src/sys/GENERIC
TSC clock: 999860477 Hz, i8254 clock: 1193151 Hz
CPU: Intel Celeron (999.89-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x68a  Stepping = 10
Features=0x383f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>
real memory  = 436142080 (425920K bytes)
avail memory = 411717632 (402068K bytes)
Preloaded elf kernel "/kernel" at 0xc0714000.
Preloaded elf module "/modules/acpi.ko" at 0xc07141e8.
Pentium Pro MTRR support enabled
md0: Malloc disk
pcibios: BIOS version 2.10
Using $PIR table, 7 entries at 0xc00fdbd0
npx0: <math processor> on motherboard
npx0: INT 16 interface
Using MMX optimized bcopy/copyin/copyout
acpi0: <GBT AWRDACPI> on motherboard
acpi0: Power Button (fixed)
Warning: ACPI is disabling APM's device.  You can't run both
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x4008-0x400b on acpi0
cpu0: <ACPI CPU (3 Cx states)> on acpi0
acpi_tz0: <Thermal Zone> on acpi0
acpi_button0: <Power Button> on acpi0
legacypci0 on motherboard
pcib0: <Intel 82443BX (440 BX) host to PCI bridge> on legacypci0
pci0: <PCI bus> on pcib0
agp0: <Intel 82443BX (440 BX) host to PCI bridge> mem 
0xd8000000-0xdbffffff at device 0.0 on pci0
pcib1: <Intel 82443BX (440 BX) PCI-PCI (AGP) bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
pci1: <ATI Rage128-RF graphics accelerator> at 0.0 irq 11
isab0: <Intel 82371AB PCI to ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel PIIX4 ATA33 controller> port 0xf000-0xf00f at device 7.1 
on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata1: at 0x170 irq 15 on atapci0
uhci0: <Intel 82371AB/EB (PIIX4) USB controller> port 0xe000-0xe01f irq 
10 at device 7.2 on pci0
usb0: <Intel 82371AB/EB (PIIX4) USB controller> on uhci0
usb0: USB revision 1.0
uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
pci0: <Intel 82371AB Power management controller> at 7.3
fxp0: <Intel 82559 Pro/100 Ethernet> port 0xe400-0xe43f mem 
0xe3100000-0xe31fffff,0xe3200000-0xe3200fff irq 5 at device 10.0 on pci0
miibus0: <MII bus> on fxp0
inphy0: <i82555 10/100 media interface> on miibus0
inphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
fxp0: MAC address: 00:90:27:d0:88:d1
fxp1: <Intel 82559 Pro/100 Ethernet> port 0xe800-0xe83f mem 
0xe3000000-0xe30fffff,0xe3201000-0xe3201fff irq 10 at device 11.0 on pci0
miibus1: <MII bus> on fxp1
inphy1: <i82555 10/100 media interface> on miibus1
inphy1:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
fxp1: MAC address: 00:06:29:71:7b:fb
orm0: <Option ROMs> at iomem 0xc0000-0xc7fff,0xc8000-0xc9fff on isa0
pmtimer0 on isa0
fdc0: cannot reserve I/O port range
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> flags 0x1 irq 1 on atkbdc0
kbd0 at atkbd0
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: model MouseMan+, device ID 0
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
sio1 at port 0x2f8-0x2ff irq 3 on isa0
sio1: type 16550A
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/16 bytes threshold
ppbus0: <Parallel port bus> on ppc0
plip0: <PLIP network interface> on ppbus0
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
ppi0: <Parallel I/O> on ppbus0
ad3: 9773MB <FUJITSU MPF3102AT> [19857/16/63] at ata1-slave UDMA33
acd0: CD-RW <LG CD-RW CED-8081B> at ata0-slave PIO4
Mounting root from ufs:/dev/ad3s1a
cd0 at ata0 bus 0 target 1 lun 0
cd0: <LG CD-RW CED-8081B 1.00> Removable CD-ROM SCSI-0 device
cd0: 16.000MB/s transfers
cd0: Attempt to query device size failed: NOT READY, Medium not present

agp0 at pci0:0:0:  class=0x060000 card=0x00000000 chip=0x71908086 rev=0x03 
hdr=0x00
    vendor   = 'Intel Corporation'
    device   = '82443BX/ZX 440BX/ZX CPU to PCI Bridge (AGP Implemented)'
    class    = bridge
    subclass = HOST-PCI
pcib1 at pci0:1:0: class=0x060400 card=0x00000000 chip=0x71918086 rev=0x03 
hdr=0x01
    vendor   = 'Intel Corporation'
    device   = '82443BX/ZX 440BX/ZX AGPset PCI-to-PCI bridge'
    class    = bridge
    subclass = PCI-PCI
isab0 at pci0:7:0: class=0x060100 card=0x00000000 chip=0x71108086 rev=0x02 
hdr=0x00
    vendor   = 'Intel Corporation'
    device   = '82371AB/EB/MB PIIX4/4E/4M ISA Bridge'
    class    = bridge
    subclass = PCI-ISA
atapci0 at pci0:7:1:       class=0x010180 card=0x00000000 chip=0x71118086 
rev=0x01 hdr=0x00
    vendor   = 'Intel Corporation'
    device   = '82371AB/EB/MB PIIX4/4E/4M IDE Controller'
    class    = mass storage
    subclass = ATA
uhci0 at pci0:7:2: class=0x0c0300 card=0x00000000 chip=0x71128086 rev=0x01 
hdr=0x00
    vendor   = 'Intel Corporation'
    device   = '82371AB/EB/MB PIIX4/4E/4M USB Interface'
    class    = serial bus
    subclass = USB
none0 at pci0:7:3: class=0x068000 card=0x00000000 chip=0x71138086 rev=0x02 
hdr=0x00
    vendor   = 'Intel Corporation'
    device   = '82371AB/EB/MB PIIX4/4E/4M Power Management Controller'
    class    = bridge
    subclass = PCI-unknown
fxp0 at pci0:10:0: class=0x020000 card=0x100c8086 chip=0x12298086 rev=0x08 
hdr=0x00
    vendor   = 'Intel Corporation'
    device   = '82557/8/9 EtherExpress PRO/100(B) Ethernet Adapter'
    class    = network
    subclass = ethernet
fxp1 at pci0:11:0: class=0x020000 card=0x305c1014 chip=0x12298086 rev=0x08 
hdr=0x00
    vendor   = 'Intel Corporation'
    device   = '82557/8/9 EtherExpress PRO/100(B) Ethernet Adapter'
    class    = network
    subclass = ethernet
none1 at pci1:0:0: class=0x030000 card=0x00081002 chip=0x52461002 rev=0x00 
hdr=0x00
    vendor   = 'ATI Technologies'
    device   = 'Rage 128 GL AGP 2x Rage Fury 16/32MB'
    class    = display
    subclass = VGA