A Dell Poweregde 1850 constantly spents about one third of its time in interrupt 16. This box has run for a year without this issue. It has an almost generic kernel, only quotas are compiled in. Rebooting (without ipmi) does not help nor updating; the issue was already present before updating to 6.4 p1, but persists. The software hardly changes, except that ipmitool is recently installed to monitor temperatures.

I tried to replicate the issue by loading / unloading the ipmi kernel module on a similiar box, but running 7.0-RELEASE-p7 . This does not lead to any problem however. Any pointers would be appreciated. It might not at all be related to ipmi, but I suspect it
to be cause since it is the only change and I loaded a kernel module for it.

Jeroen Hofstee

last pid: 12675; load averages: 1.27, 0.75, 0.65 up 6+05:56:47 23:50:57
85 processes:  1 running, 84 sleeping
CPU:  0.3% user,  0.0% nice,  0.3% system, 33.8% interrupt, 65.5% idle
Mem: 174M Active, 1514M Inact, 209M Wired, 88M Cache, 112M Buf, 14M Free
Swap: 2048M Total, 28K Used, 2048M Free

FreeBSD vh3.virtualhost.nl 6.4-RELEASE-p1 FreeBSD 6.4-RELEASE-p1 #2: Tue Dec 23 23:50:15 CET 2008
vmstat -i
interrupt                          total       rate
irq14: ata0                           47          0
irq16: uhci0                   313487360        578
irq18: uhci2                          16          0
irq23: ehci0                           3          0
irq34: mpt0                           16          0
irq37: amr0                      8894886         16
irq64: em0                      54502901        100
cpu0: timer                    904348488       1669
cpu1: timer                            1          0
cpu2: timer                   1058243496       1953
cpu3: timer                            1          0
Total                         2339477215       4317

vh3# kldstat
Id Refs Address    Size     Name
1    7 0xc0400000 7dbd28   kernel
2    2 0xc0bdc000 5c838    acpi.ko
3    1 0xc6d10000 d000     ipfw.ko
4    1 0xc6f0b000 2000     accf_http.ko
5    1 0xcc472000 a000     ipmi.ko
6    1 0xcc47c000 2000     smbus.ko

Copyright (c) 1992-2008 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.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 6.4-RELEASE-p1 #2: Tue Dec 23 23:50:15 CET 2008
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(TM) CPU 3.00GHz (2992.70-MHz 686-class CPU)
 Origin = "GenuineIntel"  Id = 0xf43  Stepping = 3
 AMD Features=0x20100000<NX,LM>
 Logical CPUs per core: 2
real memory  = 2147221504 (2047 MB)
avail memory = 2091900928 (1994 MB)
FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs
cpu0 (BSP): APIC ID:  0
cpu1 (AP): APIC ID:  1
cpu2 (AP): APIC ID:  6
cpu3 (AP): APIC ID:  7
ioapic0: Changing APIC ID to 8
ioapic1: Changing APIC ID to 9
ioapic2: Changing APIC ID to 10
ioapic0 <Version 2.0> irqs 0-23 on motherboard
ioapic1 <Version 2.0> irqs 32-55 on motherboard
ioapic2 <Version 2.0> irqs 64-87 on motherboard
kbd1 at kbdmux0
ath_hal: (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413, RF5413)
hptrr: HPT RocketRAID controller driver v1.1 (Dec 23 2008 23:49:48)
acpi0: <DELL PE BKC> on motherboard
acpi0: Power Button (fixed)
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0
acpi_hpet0: <High Precision Event Timer> iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 14318180 Hz quality 900
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
cpu2: <ACPI CPU> on acpi0
cpu3: <ACPI CPU> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib1: <ACPI PCI-PCI bridge> at device 2.0 on pci0
pci1: <ACPI PCI bus> on pcib1
pcib2: <ACPI PCI-PCI bridge> at device 0.0 on pci1
pci2: <ACPI PCI bus> on pcib2
mpt0: <LSILogic 1030 Ultra4 Adapter> port 0xec00-0xecff mem 
0xdfdf0000-0xdfdfffff,0xdfde0000-0xdfdeffff irq 34 at device 5.0 on pci2
mpt0: MPI Version=
pcib3: <ACPI PCI-PCI bridge> at device 0.2 on pci1
pci3: <ACPI PCI bus> on pcib3
amr0: <LSILogic MegaRAID 1.53> mem 0xd8ff0000-0xd8ffffff irq 37 at device 11.0 
on pci3
amr0: delete logical drives supported by controller
amr0: <LSILogic PERC 4/SC> Firmware 350O, BIOS 1.09, 64MB RAM
pcib4: <ACPI PCI-PCI bridge> at device 4.0 on pci0
pci4: <ACPI PCI bus> on pcib4
pcib5: <ACPI PCI-PCI bridge> at device 5.0 on pci0
pci5: <ACPI PCI bus> on pcib5
pcib6: <ACPI PCI-PCI bridge> at device 0.0 on pci5
pci6: <ACPI PCI bus> on pcib6
em0: <Intel(R) PRO/1000 Network Connection Version - 6.7.3> port 0xdcc0-0xdcff 
mem 0xdf9e0000-0xdf9fffff irq 64 at device 7.0 on pci6
em0: Ethernet address: 00:11:43:e6:e9:e8
pcib7: <ACPI PCI-PCI bridge> at device 0.2 on pci5
pci7: <ACPI PCI bus> on pcib7
em1: <Intel(R) PRO/1000 Network Connection Version - 6.7.3> port 0xccc0-0xccff 
mem 0xdf7e0000-0xdf7fffff irq 65 at device 8.0 on pci7
em1: Ethernet address: 00:11:43:e6:e9:e9
pcib8: <ACPI PCI-PCI bridge> at device 6.0 on pci0
pci8: <ACPI PCI bus> on pcib8
uhci0: <Intel 82801EB (ICH5) USB controller USB-A> port 0xace0-0xacff irq 16 at 
device 29.0 on pci0
usb0: <Intel 82801EB (ICH5) USB controller USB-A> 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
uhci1: <Intel 82801EB (ICH5) USB controller USB-B> port 0xacc0-0xacdf irq 19 at 
device 29.1 on pci0
usb1: <Intel 82801EB (ICH5) USB controller USB-B> on uhci1
usb1: USB revision 1.0
uhub1: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
uhci2: <Intel 82801EB (ICH5) USB controller USB-C> port 0xaca0-0xacbf irq 18 at 
device 29.2 on pci0
usb2: <Intel 82801EB (ICH5) USB controller USB-C> on uhci2
usb2: USB revision 1.0
uhub2: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub2: 2 ports with 2 removable, self powered
ehci0: <Intel 82801EB/R (ICH5) USB 2.0 controller> mem 0xdff00000-0xdff003ff 
irq 23 at device 29.7 on pci0
usb3: EHCI version 1.0
usb3: companion controllers, 2 ports each: usb0 usb1 usb2
usb3: <Intel 82801EB/R (ICH5) USB 2.0 controller> on ehci0
usb3: USB revision 2.0
uhub3: Intel EHCI root hub, class 9/0, rev 2.00/1.00, addr 1
uhub3: 6 ports with 6 removable, self powered
uhub4: vendor 0x413c product 0xa001, class 9/0, rev 2.00/0.00, addr 2
uhub4: multiple transaction translators
uhub4: 2 ports with 2 removable, self powered
pcib9: <ACPI PCI-PCI bridge> at device 30.0 on pci0
pci9: <ACPI PCI bus> on pcib9
pci9: <display, VGA> at device 13.0 (no driver attached)
isab0: <PCI-ISA bridge> at device 31.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <Intel ICH5 UDMA100 controller> port 
0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xfc00-0xfc0f at device 31.1 on pci0
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
fdc0: <floppy drive controller> port 0x3f0-0x3f5,0x3f7 irq 6 drq 2 on acpi0
fdc0: [FAST]
sio0: <16550A-compatible COM port> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
sio0: type 16550A
pmtimer0 on isa0
orm0: <ISA Option ROMs> at iomem 
0xc0000-0xcafff,0xcb000-0xcbfff,0xcc000-0xcc7ff,0xce000-0xcefff,0xec000-0xeffff on 
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
ppc0: parallel port not found.
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
sio1: configured irq 3 not in bitmap of probed irqs 0
sio1: port may not be enabled
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounters tick every 1.000 msec
hptrr: no controller detected.
Waiting 5 seconds for SCSI devices to settle
acd0: DVDROM <HL-DT-STDVD-ROM GDR8082N/0106> at ata0-master UDMA33
amr0: delete logical drives supported by controller
amrd0: <LSILogic MegaRAID logical drive> on amr0
amrd0: 69880MB (143114240 sectors) RAID 1 (optimal)
SMP: AP CPU #1 Launched!
SMP: AP CPU #2 Launched!
SMP: AP CPU #3 Launched!
Trying to mount root from ufs:/dev/amrd0s1a
ipfw2 (+ipv6) initialized, divert loadable, rule-based forwarding disabled, 
default to deny, logging disabled

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