I extracted the dmesg that was at the bottom of the op's email for reference.
The Intel Atom 270 is a single physical core with a new type of hyperthreading. I notice that the dmesg reports it as two separate cpus (cpu0 cpu1). I'm guessing that this would mean that with dual core Atom 330 it bsd.mp would report four cpus? (cut and pasted dmesg) OpenBSD 4.4-current (GENERIC.MP) #1171: Sat Nov 29 17:25:48 MST 2008 [EMAIL PROTECTED]:/usr/src/sys/arch/i386/compile/GENERIC.MP cpu0: Intel(R) Atom(TM) CPU N270 @ 1.60GHz ("GenuineIntel" 686-class) 1.61 GHz cpu0: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,DS, ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,EST,TM2,xTPR real mem = 1064529920 (1015MB) avail mem = 1021018112 (973MB) mainbus0 at root bios0 at mainbus0: AT/286+ BIOS, date 09/11/08, BIOS32 rev. 0 @ 0xf0010, SMBIOS rev. 2.5 @ 0xf0690 (33 entries) bios0: vendor American Megatrends Inc. version "0802" date 09/11/2008 bios0: ASUSTeK Computer INC. B202 acpi0 at bios0: rev 0 acpi0: tables DSDT FACP APIC MCFG OEMB HPET SSDT acpi0: wakeup devices P0P2(S4) P0P1(S4) MC97(S4) HDAC(S4) P0P4(S4) P0P5(S4) P0P7(S4) P0P8(S4) P0P9(S4) USB0(S4) USB1(S4) USB2(S4) USB3(S4) EUSB(S4) P0P6(S4) acpitimer0 at acpi0: 3579545 Hz, 24 bits acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat cpu0 at mainbus0: apid 0 (boot processor) cpu0: apic clock running at 134MHz cpu1 at mainbus0: apid 1 (application processor) cpu1: Intel(R) Atom(TM) CPU N270 @ 1.60GHz ("GenuineIntel" 686-class) 1.61 GHz cpu1: FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,DS, ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,SBF,SSE3,MWAIT,DS-CPL,EST,TM2,xTPR ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins ioapic0: misconfigured as apic 1, remapped to apid 2 acpihpet0 at acpi0: 14318179 Hz acpiprt0 at acpi0: bus 0 (PCI0) acpiprt1 at acpi0: bus 5 (P0P1) acpiprt2 at acpi0: bus 4 (P0P4) acpiprt3 at acpi0: bus 3 (P0P5) acpiprt4 at acpi0: bus 1 (P0P6) acpicpu0 at acpi0 acpicpu1 at acpi0 acpiasus0 at acpi0 acpibtn0 at acpi0: PWRB acpivideo at acpi0 not configured bios0: ROM list: 0xc0000/0xec00! 0xcf000/0x1000 cpu0: unknown Enhanced SpeedStep CPU, msr 0x060f0c2606000c26 cpu0: using only highest and lowest power states cpu0: Enhanced SpeedStep 1600 MHz (1308 mV): speeds: 1600, 800 MHz pci0 at mainbus0 bus 0: configuration mode 1 (bios) pchb0 at pci0 dev 0 function 0 "Intel 82945GME Host" rev 0x03 vga1 at pci0 dev 2 function 0 "Intel 82945GME Video" rev 0x03 wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation) wsdisplay0: screen 1-5 added (80x25, vt100 emulation) intagp0 at vga1 agp0 at intagp0: aperture at 0xd0000000, size 0x10000000 inteldrm0 at vga1 drm0 at inteldrm0 "Intel 82945GM Video" rev 0x03 at pci0 dev 2 function 1 not configured azalia0 at pci0 dev 27 function 0 "Intel 82801GB HD Audio" rev 0x02: apic 2 int 16 (irq 5) azalia0: codecs: Realtek ALC888 audio0 at azalia0 ppb0 at pci0 dev 28 function 0 "Intel 82801GB PCIE" rev 0x02: apic 2 int 16 (irq 5) pci1 at ppb0 bus 4 re0 at pci1 dev 0 function 0 "Realtek 8168" rev 0x02: RTL8168C/8111C (0x3c00), apic 2 int 16 (irq 5), address 00:23:54:xx:yy:zz rgephy0 at re0 phy 7: RTL8169S/8110S PHY, rev. 2 ppb1 at pci0 dev 28 function 1 "Intel 82801GB PCIE" rev 0x02: apic 2 int 17 (irq 10) pci2 at ppb1 bus 3 ral0 at pci2 dev 0 function 0 "Ralink RT2790" rev 0x00: apic 2 int 17 (irq 10), address 00:22:43:xx:yy:zz ral0: MAC/BBP RT2872 (rev 0x0200), RF RT2720 (1T2R) ppb2 at pci0 dev 28 function 2 "Intel 82801GB PCIE" rev 0x02: apic 2 int 18 (irq 11) pci3 at ppb2 bus 1 uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x02: apic 2 int 23 (irq 3) uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x02: apic 2 int 19 (irq 7) uhci2 at pci0 dev 29 function 2 "Intel 82801GB USB" rev 0x02: apic 2 int 18 (irq 11) uhci3 at pci0 dev 29 function 3 "Intel 82801GB USB" rev 0x02: apic 2 int 16 (irq 5) ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x02: apic 2 int 23 (irq 3) usb0 at ehci0: USB revision 2.0 uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1 ppb3 at pci0 dev 30 function 0 "Intel 82801BAM Hub-to-PCI" rev 0xe2 pci4 at ppb3 bus 5 ichpcib0 at pci0 dev 31 function 0 "Intel 82801GBM LPC" rev 0x02: PM disabled pciide0 at pci0 dev 31 function 2 "Intel 82801GBM SATA" rev 0x02: DMA, channel 0 wired to compatibility, channel 1 wired to compatibility wd0 at pciide0 channel 0 drive 0: <ST9160310AS> wd0: 16-sector PIO, LBA48, 152627MB, 312581808 sectors wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 5 ichiic0 at pci0 dev 31 function 3 "Intel 82801GB SMBus" rev 0x02: apic 2 int 19 (irq 7) iic0 at ichiic0 spdmem0 at iic0 addr 0x50: 512MB DDR2 SDRAM non-parity PC2-5300CL5 SO-DIMM spdmem1 at iic0 addr 0x51: 512MB DDR2 SDRAM non-parity PC2-5300CL5 SO-DIMM usb1 at uhci0: USB revision 1.0 uhub1 at usb1 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb2 at uhci1: USB revision 1.0 uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb3 at uhci2: USB revision 1.0 uhub3 at usb3 "Intel UHCI root hub" rev 1.00/1.00 addr 1 usb4 at uhci3: USB revision 1.0 uhub4 at usb4 "Intel UHCI root hub" rev 1.00/1.00 addr 1 isa0 at ichpcib0 isadma0 at isa0 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 midi0 at pcppi0: <PC speaker> spkr0 at pcppi0 wbsio0 at isa0 port 0x2e/2: W83627DHG rev 0x23 lm1 at wbsio0 port 0x290/8: W83627DHG npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16 mtrr: Pentium Pro MTRR support umass0 at uhub0 port 6 configuration 1 interface 0 "Generic USB2.0-CRW" rev 2.00/58.87 addr 2 umass0: using SCSI over Bulk-Only scsibus0 at umass0: 2 targets, initiator 0 sd0 at scsibus0 targ 1 lun 0: <Generic-, Multi-Card, 1.00> SCSI0 0/direct removable sd0: drive offline uhidev0 at uhub1 port 1 configuration 1 interface 0 "Cherry Mikroschalter My3000 keyboard" rev 2.00/0.26 addr 2 uhidev0: iclass 3/1 ukbd0 at uhidev0: 8 modifier keys, 6 key codes wskbd1 at ukbd0 mux 1 wskbd1: connecting to wsdisplay0 uhidev1 at uhub1 port 2 configuration 1 interface 0 "B16_b_02 USB-PS/2 Optical Mouse" rev 2.00/98.02 addr 3 uhidev1: iclass 3/1 ums0 at uhidev1: 4 buttons, Z dir wsmouse0 at ums0 mux 0 softraid0 at root root on wd0a swap on wd0b dump on wd0b