Running stable OpenBSD 5.2 and in the top I see high interrupt CPU
utilization despite machine being idle. I am not sure if I should be worried
or if the is some sort of bug. Please advise.

dmesg:
OpenBSD 5.2-stable (MERCURY.MP) #0: Sun Jan 27 21:58:30 JST 2013
    r...@mercury.askyan.com:/usr/src/sys/arch/amd64/compile/MERCURY.MP
real mem = 4149907456 (3957MB)
avail mem = 4017065984 (3830MB)
mainbus0 at root
bios0 at mainbus0: SMBIOS rev. 2.7 @ 0xeb770 (76 entries)
bios0: vendor American Megatrends Inc. version "V1.1" date 07/30/2012
bios0: MSI MS-7808
acpi0 at bios0: rev 2
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP APIC FPDT MCFG HPET SSDT SSDT SSDT ASF!
acpi0: wakeup devices PS2K(S3) PS2M(S3) P0P1(S4) USB1(S3) USB2(S3) USB3(S3)
USB4(S3) USB5(S3) USB6(S3) USB7(S3) PXSX(S4) RP01(S4) PXSX(S4) RP02(S4)
PXSX(S4) RP03(S4) PXSX(S4) RP04(S4) PXSX(S4) RP05(S4) PXSX(S4) RP06(S4)
PXSX(S4) RP07(S4) PXSX(S4) RP08(S4) PEGP(S4) PEG0(S4) PEG1(S4) PEG2(S4)
PEG3(S4) GLAN(S4) EHC1(S4) EHC2(S4) XHC_(S4) HDEF(S4) PWRB(S3)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: Intel(R) Core(TM) i3-3220T CPU @ 2.80GHz, 2794.06 MHz
cpu0:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,PCLMUL,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT,XSAVE,AVX,NXE,LONG,LAHF
cpu0: 256KB 64b/line 8-way L2 cache
cpu0: apic clock running at 99MHz
cpu1 at mainbus0: apid 2 (application processor)
cpu1: Intel(R) Core(TM) i3-3220T CPU @ 2.80GHz, 2793.66 MHz
cpu1:
FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,PCLMUL,MWAIT,DS-CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT,XSAVE,AVX,NXE,LONG,LAHF
cpu1: 256KB 64b/line 8-way L2 cache
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins
acpimcfg0 at acpi0 addr 0xf8000000, bus 0-63
acpihpet0 at acpi0: 14318179 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus 4 (P0P1)
acpiprt2 at acpi0: bus 2 (RP01)
acpiprt3 at acpi0: bus 3 (RP02)
acpiprt4 at acpi0: bus -1 (RP03)
acpiprt5 at acpi0: bus -1 (RP04)
acpiprt6 at acpi0: bus -1 (RP05)
acpiprt7 at acpi0: bus -1 (RP06)
acpiprt8 at acpi0: bus -1 (RP07)
acpiprt9 at acpi0: bus -1 (RP08)
acpiprt10 at acpi0: bus 1 (PEG0)
acpiprt11 at acpi0: bus -1 (PEG1)
acpiprt12 at acpi0: bus -1 (PEG2)
acpiprt13 at acpi0: bus -1 (PEG3)
acpiec0 at acpi0: Failed to read resource settings
acpicpu0 at acpi0: C3, C1, PSS
acpicpu1 at acpi0: C3, C1, PSS
acpipwrres0 at acpi0: FN00
acpipwrres1 at acpi0: FN01
acpipwrres2 at acpi0: FN02
acpipwrres3 at acpi0: FN03
acpipwrres4 at acpi0: FN04
acpitz0 at acpi0: critical temperature is 92 degC
acpitz1 at acpi0: critical temperature is 92 degC
acpibat0 at acpi0: BAT0 not present
acpibat1 at acpi0: BAT1 not present
acpibat2 at acpi0: BAT2 not present
acpibtn0 at acpi0: PWRB
acpibtn1 at acpi0: LID0
acpivideo0 at acpi0: GFX0
acpivout0 at acpivideo0: DD02
cpu0: Enhanced SpeedStep 2794 MHz: speeds: 2800, 2700, 2600, 2500, 2400,
2300, 2200, 2100, 2000, 1900, 1800, 1700, 1600 MHz
pci0 at mainbus0 bus 0
pchb0 at pci0 dev 0 function 0 "Intel Xeon E3-1200v2 Host" rev 0x09
ppb0 at pci0 dev 1 function 0 vendor "Intel", unknown product 0x0151 rev
0x09: msi
pci1 at ppb0 bus 1
em0 at pci1 dev 0 function 0 "Intel PRO/1000 PT (82571EB)" rev 0x06: apic 2
int 16, address 00:15:17:21:2a:3e
em1 at pci1 dev 0 function 1 "Intel PRO/1000 PT (82571EB)" rev 0x06: apic 2
int 17, address 00:15:17:21:2a:3f
vga1 at pci0 dev 2 function 0 "Intel HD Graphics 2500" rev 0x09
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
intagp at vga1 not configured
"Intel 7 Series xHCI" rev 0x04 at pci0 dev 20 function 0 not configured
"Intel 7 Series MEI" rev 0x04 at pci0 dev 22 function 0 not configured
ehci0 at pci0 dev 26 function 0 "Intel 7 Series USB" rev 0x04: apic 2 int 16
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb1 at pci0 dev 28 function 0 "Intel 7 Series PCIE" rev 0xc4: msi
pci2 at ppb1 bus 2
ppb2 at pci0 dev 28 function 1 "Intel 7 Series PCIE" rev 0xc4: msi
pci3 at ppb2 bus 3
re0 at pci3 dev 0 function 0 "Realtek 8168" rev 0x06: RTL8168E/8111E-VL
(0x2c80), apic 2 int 17, address d4:3d:7e:35:62:7b
rgephy0 at re0 phy 7: RTL8169S/8110S PHY, rev. 5
ehci1 at pci0 dev 29 function 0 "Intel 7 Series USB" rev 0x04: apic 2 int 23
usb1 at ehci1: USB revision 2.0
uhub1 at usb1 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb3 at pci0 dev 30 function 0 "Intel 82801BA Hub-to-PCI" rev 0xa4
pci4 at ppb3 bus 4
pcib0 at pci0 dev 31 function 0 "Intel B75 LPC" rev 0x04
ahci0 at pci0 dev 31 function 2 "Intel 7 Series AHCI" rev 0x04: msi, AHCI
1.3
scsibus0 at ahci0: 32 targets
sd0 at scsibus0 targ 0 lun 0: <ATA, M4-CT064M4SSD2, 040H> SCSI3 0/direct
fixed naa.500a075109196cd0
sd0: 61057MB, 512 bytes/sector, 125045424 sectors, thin
ichiic0 at pci0 dev 31 function 3 "Intel 7 Series SMBus" rev 0x04: apic 2
int 18
iic0 at ichiic0
spdmem0 at iic0 addr 0x50: 4GB DDR3 SDRAM PC3-12800
isa0 at pcib0
isadma0 at isa0
com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
com0: probed fifo depth: 15 bytes
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
mtrr: Pentium Pro MTRR support
uhub2 at uhub0 port 1 "Intel Rate Matching Hub" rev 2.00/0.00 addr 2
uhidev0 at uhub2 port 1 configuration 1 interface 0 "vendor 0x04f3 product
0x0103" rev 1.10/1.07 addr 3
uhidev0: iclass 3/1
ukbd0 at uhidev0: 8 variable keys, 6 key codes
wskbd1 at ukbd0 mux 1
wskbd1: connecting to wsdisplay0
uhidev1 at uhub2 port 1 configuration 1 interface 1 "vendor 0x04f3 product
0x0103" rev 1.10/1.07 addr 3
uhidev1: iclass 3/0, 2 report ids
uhid0 at uhidev1 reportid 1: input=2, output=0, feature=0
uhid1 at uhidev1 reportid 2: input=1, output=0, feature=0
uhub3 at uhub1 port 1 "Intel Rate Matching Hub" rev 2.00/0.00 addr 2


vmstat:
    1 users    Load 0.20 0.33 0.38                     Thu Jan 31 01:58:55
2013

            memory totals (in KB)            PAGING   SWAPPING    
Interrupts
           real   virtual     free           in  out   in  out      205
total
Active  1156244   1156244   167332   ops                            200
clock
All     3763872   3763872  1211556   pages                            2 ipi
                                                                      1 em0
Proc:r  d  s  w    Csw   Trp   Sys   Int   Sof  Flt       forks        
ehci0
        6  6        12     1    30172026   101    7       fkppw        
ehci1
                                                          fksvm       2
ahci0
  20.6%Int   0.0%Sys   0.0%Usr   0.0%Nic  79.4%Idle       pwait
|    |    |    |    |    |    |    |    |    |    |       relck
||||||||||                                                rlkok
                                                          noram
Namei         Sys-cache    Proc-cache    No-cache         ndcpy
    Calls     hits    %    hits     %    miss   %         fltcp
       21       21  100                                   zfod
                                                          cow
Disks   sd0                                         32760 fmin
seeks                                               43680 ftarg
xfers     2                                        103367 itarg
speed   26K                                             2 wired
  sec   0.0                                               pdfre
                                                          pdscn
                                                          pzidle
                                                       13 kmapent



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