I just upgraded my system and did a clean install of Ubuntu when I did (Installed Oneiric Ocelot from the CD last week but yesterday upgraded to 12.04 LTS). I have an i7 920 (quad core with hyperthreading), so I should be seeing 8 processors, but I only see one in the System Monitor graph.

cat /proc/cpuinfo returns:

processor   : 0

vendor_id   : GenuineIntel

cpu family  : 6

model       : 26

model name  : Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz

stepping    : 4

microcode   : 0x10

cpu MHz     : 2672.633

cache size  : 8192 KB

physical id : 0

siblings    : 1

core id     : 0

cpu cores   : 1

apicid      : 0

initial apicid  : 0

fpu     : yes

fpu_exception   : yes

cpuid level : 11

wp      : yes

flags       : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc up arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 sse4_2 popcnt lahf_lm ida dts tpr_shadow vnmi flexpriority ept vpid

bogomips    : 5345.26

clflush size    : 64

cache_alignment : 64

address sizes   : 36 bits physical, 48 bits virtual

power management:

From my recollection of previous installs with SMP working, there should be multiple entries in /proc/cpuinfo--one per processor. I see only one.

My first thought was that a non-SMP kernel was installed. However, uname -a returns:

Linux compname 3.2.0-24-generic #37-Ubuntu SMP Wed Apr 25 08:43:22 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

So am I using all available cores or not? And if not, what is causing it given that I appear to be running an SMP kernel?

Thanks!