I don't have Linux lying around but sysctl -a | grep cpu from OS X:

hw.ncpu = 2
hw.cpufrequency = 1660000000
hw.availcpu = 2
hw.ncpu: 2
hw.activecpu: 2
hw.physicalcpu: 1
hw.physicalcpu_max: 1
hw.logicalcpu: 2
hw.logicalcpu_max: 2
hw.cputype: 7
hw.cpusubtype: 4
hw.cpu64bit_capable: 0
hw.cpufamily: 1114597871
hw.cpufrequency: 1660000000
hw.cpufrequency_min: 1660000000
hw.cpufrequency_max: 1660000000
hw.cputhreadtype: 1
machdep.cpu.max_basic: 10
machdep.cpu.max_ext: 2147483656
machdep.cpu.vendor: GenuineIntel
machdep.cpu.brand_string: Intel(R) Atom(TM) CPU N280 @ 1.66GHz
machdep.cpu.family: 6
machdep.cpu.model: 15
machdep.cpu.extmodel: 1
machdep.cpu.extfamily: 0
machdep.cpu.stepping: 2
machdep.cpu.feature_bits: 3219782655 4244381
machdep.cpu.extfeature_bits: 0 1
machdep.cpu.signature: 67266
machdep.cpu.brand: 0
machdep.cpu.features: FPU VME DE PSE TSC MSR PAE MCE CX8 APIC SEP MTRR PGE MCA CMOV PAT CLFSH DS ACPI MMX FXSR SSE SSE2 SS HTT TM SSE3 MON DSCPL EST TM2 SSSE3 TPR PDCM
machdep.cpu.extfeatures: LAHF
machdep.cpu.logical_per_package: 2
machdep.cpu.cores_per_package: 1
machdep.cpu.microcode_version: 530
machdep.cpu.mwait.linesize_min: 64
machdep.cpu.mwait.linesize_max: 64
machdep.cpu.mwait.extensions: 3
machdep.cpu.mwait.sub_Cstates: 131616
machdep.cpu.thermal.sensor: 1
machdep.cpu.thermal.dynamic_acceleration: 0
machdep.cpu.thermal.invariant_APIC_timer: 0
machdep.cpu.thermal.thresholds: 2
machdep.cpu.thermal.ACNT_MCNT: 1
machdep.cpu.arch_perf.version: 3
machdep.cpu.arch_perf.number: 2
machdep.cpu.arch_perf.width: 40
machdep.cpu.arch_perf.events_number: 7
machdep.cpu.arch_perf.events: 0
machdep.cpu.arch_perf.fixed_number: 1
machdep.cpu.arch_perf.fixed_width: 40
machdep.cpu.cache.linesize: 64
machdep.cpu.cache.L2_associativity: 8
machdep.cpu.cache.size: 512
machdep.cpu.tlb.inst.small: 32
machdep.cpu.tlb.data.small: 16
machdep.cpu.tlb.data.large_level1: 64
machdep.cpu.address_bits.physical: 32
machdep.cpu.address_bits.virtual: 32
machdep.cpu.core_count: 1
machdep.cpu.thread_count: 2