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after ca. one day of operation I start experiencing an interrupt storm
on my SB600 SATA controller.
"systat -v" reports around 470k interrupts on atapci0 (irq22).
Error messaage: interrupt storm detected on "irq22:"; throttling
interrupt source.

The interrupt rate shown in "vmstat -i" keeps increasing steadily at
about 5 per second.

I have already tried the following without positive results:
1. tried both of the two available timers, ACPI-Safe and HPET.
2. tried the latest ACPICA patch (acpica-import-20071114.diff)
3. I use the patch from kern/118193 ( ). Without that
patch, the controller runs in UDMA33 mode, but this has no effect on the
interrupt storm that occurs after ca. one day of operation.

In the dmesg output there are unattached devices, if I attach USB, the
problem is not solved.

OS: FreeBSD 7.0-BETA3 amd64 as of today
CPU: AMD Athlon X2 5600+ in SMP mode
Mainboard: MSI MS-7368 (K9AG Neo2-Digital) with the AMD 690G chipset.

"dmesg", "vmstat -i" and "systat -v" outputs are attached.

What might be the cause?
What should I do to debug this problem?

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1 users Load 0.05 0.09 0.12 Nov 24 11:44

Tot Share Tot Share Free in out in out
Act 472716 36772 1107084 53808 1005348 count
All 601696 113500 5910668 234920 pages
Proc: Interrupts
r p d s w Csw Trp Sys Int Sof Flt 159 cow 474k total
4 103 4243 393 471 470k 1012 375 156 zfod atkbd0 1
ozfod acpi0 irq9
2.9%Sys 0.4%Intr 0.2%User 0.0%Nice 96.5%Idle %ozfod 470k atapci0 22
| | | | | | | | | | | daefr 2001 cpu0: time
=+ 134 prcfr 7 re0 irq256
31 dtbuf 389 totfr 2001 cpu1: time
Namei Name-cache Dir-cache 200000 desvn react
Calls hits % hits % 134476 numvn pdwak
937 937 100 24982 frevn pdpgs
Disks ad4 ad6 436196 wire
KB/t 0.50 0.50 470504 act
tps 0 0 2091520 inact
MB/s 0.00 0.00 13484 cache
%busy 0 0 991864 free
219632 buf

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interrupt total rate
irq1: atkbd0 11 0
irq9: acpi0 1 0
irq22: atapci0 2345651167 23043
cpu0: timer 199854076 1999
irq256: re0 459211 4
cpu1: timer 199853873 1999
Total 1871024631 18719

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Copyright (c) 1992-2007 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 7.0-BETA3 #25: Thu Nov 22 19:32:43 CET 2007
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: AMD Athlon(tm) 64 X2 Dual Core Processor 5600+ (2800.68-MHz K8-class CPU)
Origin = "AuthenticAMD" Id = 0x40f33 Stepping = 3
AMD Features=0xea500800
AMD Features2=0x1f
Cores per package: 2
usable memory = 4252438528 (4055 MB)
avail memory = 4097650688 (3907 MB)
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
cpu0 (BSP): APIC ID: 0
cpu1 (AP): APIC ID: 1
ioapic0 irqs 0-23 on motherboard
kbd1 at kbdmux0
acpi0: on motherboard
acpi0: [ITHREAD]
acpi0: Power Button (fixed)
acpi0: reservation of 0, a0000 (3) failed
acpi0: reservation of 100000, ddf00000 (3) failed
ACPI HPET table warning: Sequence is non-zero (2)
Timecounter "ACPI-safe" frequency 3579545 Hz quality 850
acpi_timer0: <32-bit timer at 3.579545MHz> port 0x808-0x80b on acpi0
acpi_hpet0: iomem 0xfed00000-0xfed003ff on acpi0
Timecounter "HPET" frequency 14318180 Hz quality 900
cpu0: on acpi0
acpi_throttle0: on cpu0
acpi_throttle0: CLK_VAL field overlaps THT_EN bit
device_attach: acpi_throttle0 attach returned 6
powernow0: on cpu0
cpu1: on acpi0
powernow1: on cpu1
pcib0: port 0xcf8-0xcff on acpi0
pci0: on pcib0
pcib1: at device 1.0 on pci0
pci1: on pcib1
vgapci0: port 0xc000-0xc0ff mem 0xfc000000-0xfdffffff,0xfe9f0000-0xfe9fffff,0xfe800000-0xfe8fffff irq 18 at device 5.0 on pci1
pci1: at device 5.2 (no driver attached)
pcib2: at device 7.0 on pci0
pci2: on pcib2
re0: port 0xd800-0xd8ff mem 0xfeaff000-0xfeafffff irq 19 at device 0.0 on pci2
re0: Using 2 MSI messages
miibus0: on re0
rgephy0: PHY 1 on miibus0
rgephy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, 1000baseT, 1000baseT-FDX, auto
re0: Ethernet address: 00:19:db:f5:9c:ca
re0: [FILTER]
re0: [FILTER]
atapci0: port 0xb000-0xb007,0xa000-0xa003,0x9000-0x9007,0x8000-0x8003,0x7000-0x700f mem 0xfe7ff800-0xfe7ffbff irq 22 at device 18.0 on pci0
atapci0: [ITHREAD]
atapci0: AHCI Version 01.10 controller with 4 ports detected
ata2: on atapci0
ata2: [ITHREAD]
ata3: on atapci0
ata3: [ITHREAD]
ata4: on atapci0
ata4: [ITHREAD]
ata5: on atapci0
ata5: [ITHREAD]
pci0: at device 19.0 (no driver attached)
pci0: at device 19.1 (no driver attached)
pci0: at device 19.2 (no driver attached)
pci0: at device 19.3 (no driver attached)
pci0: at device 19.4 (no driver attached)
pci0: at device 19.5 (no driver attached)
pci0: at device 20.0 (no driver attached)
atapci1: port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xff00-0xff0f at device 20.1 on pci0
ata0: on atapci1
ata0: [ITHREAD]
isab0: at device 20.3 on pci0
isa0: on isab0
pcib3: at device 20.4 on pci0
pci3: on pcib3
acpi_button0: on acpi0
atkbdc0: port 0x60,0x64 irq 1 on acpi0
atkbd0: irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
atkbd0: [ITHREAD]
cryptosoft0: on motherboard
orm0: at iomem 0xcd800-0xce7ff on isa0
sc0: at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
Timecounters tick every 1.000 msec
Fast IPsec: Initialized Security Association Processing.
ad4: 381554MB at ata2-master SATA300
ad6: 381554MB at ata3-master SATA300
SMP: AP CPU #1 Launched!
Trying to mount root from ufs:/dev/ad4s1a
re0: link state changed to UP

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