1.8b Development

As stated in my other thread I just installed 1.8 at home.
When idle the box now has 14% CPU load all of which top accounts to interrupts. I'm curious if this is normal behaviour, or how I can check what causes this load. vmstat and systat are not available in m0n0wall, so I have no idea how to check. No hardware changes, 1.3 was running just fine.

What hardware are you running on, including the NICs?

In System: Advanced setup, can you try to enable Device Polling? Might help if your NICs are supported.

I'm already using device polling, it significantly helped throughput on 1.3... Not sure if trying to turn it off now would make sense.

It's a good old VIA EPIA 800MHz, booting from a USB key. I'm always using it to test new setups and modifications, and I never had problems with it. There's an IDE HDD in the box too where I dd the image to if it works fine.
NICs are the onboard one and a dual-port gbit intel

Excerpts from dmesg regarding hardware:

FreeBSD 8.2-RELEASE-p6 #0: Thu Jun 21 16:11:06 CEST 2012
    root@builder82.m0n0.ch:/usr/m0n0wall/build82/tmp/sys/i386/compile/M0N0WALL_GENERIC i386
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: VIA Samuel 2 (799.62-MHz 686-class CPU)
  Origin = "CentaurHauls"  Id = 0x673  Family = 6  Model = 7  Stepping = 3
  Features=0x803035<FPU,DE,TSC,MSR,MTRR,PGE,MMX>
real memory  = 536870912 (512 MB)
avail memory = 456601600 (435 MB)
wlan: mac acl policy registered
kbd1 at kbdmux0
cryptosoft0: <software crypto> on motherboard
acpi0: <VT9174 AWRDACPI> on motherboard
acpi0: [ITHREAD]
acpi0: Power Button (fixed)
acpi0: reservation of 0, a0000 (3) failed
acpi0: reservation of 100000, 1eef0000 (3) failed
Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000
acpi_timer0: <24-bit timer at 3.579545MHz> port 0x408-0x40b on acpi0
cpu0: <ACPI CPU> on acpi0
acpi_button0: <Power Button> on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
pcib1: <PCI-PCI bridge> at device 1.0 on pci0
pci1: <PCI bus> on pcib1
vgapci0: <VGA-compatible display> mem 0xe0000000-0xe3ffffff,0xe4000000-0xe4ffffff irq 11 at device 0.0 on pci1
uhci0: <VIA 83C572 USB controller> port 0xd000-0xd01f irq 11 at device 16.0 on pci0
uhci0: [ITHREAD]
usbus0: <VIA 83C572 USB controller> on uhci0
uhci1: <VIA 83C572 USB controller> port 0xd400-0xd41f irq 12 at device 16.1 on pci0
uhci1: [ITHREAD]
usbus1: <VIA 83C572 USB controller> on uhci1
uhci2: <VIA 83C572 USB controller> port 0xd800-0xd81f irq 10 at device 16.2 on pci0
uhci2: [ITHREAD]
usbus2: <VIA 83C572 USB controller> on uhci2
ehci0: <VIA VT6202 USB 2.0 controller> mem 0xe8080000-0xe80800ff irq 5 at device 16.3 on pci0
ehci0: [ITHREAD]
usbus3: EHCI version 1.0
usbus3: <VIA VT6202 USB 2.0 controller> on ehci0
isab0: <PCI-ISA bridge> at device 17.0 on pci0
isa0: <ISA bus> on isab0
atapci0: <VIA 8235 UDMA133 controller> port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xdc00-0xdc0f at device 17.1 on pci0
ata0: <ATA channel 0> on atapci0
ata0: [ITHREAD]
ata1: <ATA channel 1> on atapci0
ata1: [ITHREAD]
vr0: <VIA VT6102 Rhine II 10/100BaseTX> port 0xe000-0xe0ff mem 0xe8081000-0xe80810ff irq 11 at device 18.0 on pci0
vr0: Quirks: 0x0
vr0: Revision: 0x74
miibus0: <MII bus> on vr0
ukphy0: <Generic IEEE 802.3u media interface> PHY 1 on miibus0
ukphy0:  10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
vr0: Ethernet address: 00:40:63:dc:b2:ad
vr0: [ITHREAD]
em0: <Intel(R) PRO/1000 Legacy Network Connection 1.0.3> port 0xe400-0xe43f mem 0xe8040000-0xe805ffff,0xe8000000-0xe803ffff irq 12 at device 20.0 on pci0
em0: [FILTER]
em0: Ethernet address: 00:11:0a:55:ef:c6
em1: <Intel(R) PRO/1000 Legacy Network Connection 1.0.3> port 0xe800-0xe83f mem 0xe8060000-0xe807ffff irq 10 at device 20.1 on pci0
em1: [FILTER]
em1: Ethernet address: 00:11:0a:55:ef:c7
atrtc0: <AT realtime clock> port 0x70-0x73 irq 8 on acpi0
pmtimer0 on isa0
orm0: <ISA Option ROMs> at iomem 0xd0000-0xd7fff,0xd8000-0xd97ff pnpid ORM0000 on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
atkbd0: [ITHREAD]
uart0: <16550 or compatible> at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
uart0: [FILTER]
acpi_throttle0: <ACPI CPU Throttling> on cpu0
Timecounter "TSC" frequency 799619590 Hz quality 800
Timecounters tick every 1.000 msec
IPsec: Initialized Security Association Processing.
IP Filter: v4.1.34 initialized.  Default = block all, Logging = enabled
md0: Preloaded image </mfsroot> 38858752 bytes at 0xc0d7b4d4
usbus0: 12Mbps Full Speed USB v1.0
usbus1: 12Mbps Full Speed USB v1.0
usbus2: 12Mbps Full Speed USB v1.0
usbus3: 480Mbps High Speed USB v2.0
ad0: 305245MB <Seagate ST3320620A 3.AAE> at ata0-master PIO4
ugen0.1: <VIA> at usbus0
uhub0: <VIA UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus0
ugen1.1: <VIA> at usbus1
uhub1: <VIA UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus1
ugen2.1: <VIA> at usbus2
uhub2: <VIA UHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus2
ugen3.1: <VIA> at usbus3
uhub3: <VIA EHCI root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus3
Root mount waiting for: usbus3 usbus2 usbus1 usbus0
uhub0: 2 ports with 2 removable, self powered
uhub1: 2 ports with 2 removable, self powered
uhub2: 2 ports with 2 removable, self powered
Root mount waiting for: usbus3
Root mount waiting for: usbus3
uhub3: 6 ports with 6 removable, self powered
Root mount waiting for: usbus3
ugen3.2: <USB> at usbus3
umass0: <USB Flash Disk, class 0/0, rev 2.00/1.00, addr 2> on usbus3
Root mount waiting for: usbus3
Trying to mount root from ufs:/dev/md0
da0 at umass-sim0 bus 0 scbus0 target 0 lun 0
da0: <USB Flash Disk 5.00> Removable Direct Access SCSI-2 device
da0: 40.000MB/s transfers
da0: 2003MB (4102144 512 byte sectors: 255H 63S/T 255C)
ipfw2 (+ipv6) initialized, divert loadable, nat loadable, rule-based forwarding enabled, default to accept, logging disabled
load_dn_sched dn_sched FIFO loaded
load_dn_sched dn_sched QFQ loaded
load_dn_sched dn_sched RR loaded
load_dn_sched dn_sched WF2Q+ loaded
load_dn_sched dn_sched PRIO loaded
em1: link state changed to UP
em0: link state changed to UP

Does this help in any way?

Code:

$ /tmp/vmstat -i
interrupt                          total       rate
irq0: clk                         180289        996
irq5: ehci0                          252          1
irq8: rtc                          23074        127
Total                             203615       1124

systat unfortunately seems to be an interactive ncurses tool.