2

I have a Samsung NP550P7C laptop with an Intel(R) Core(TM) i5-3210M CPU @ 2.50GHz

Under Ubuntu 12.04 32bit, lscpu and /proc/cpuinfo detect 4 CPUs
but lshw only shows 2 CPUs

Could there be some sort of misconfiguration or am i getting something wrong?

Here some details, I hope these are the relevant lines:

ubuntu 12.04:

lshw:
...
    configuration: boot=normal chassis=laptop cpus=2 family=SAMSUNG SENS sku=SAMSUNG SENS Series ...
...
     *-cpu:0
...
          configuration: cores=2 enabledcores=2 id=1 threads=4
...
     *-cpu:1
...
          configuration: id=1
...

There is no cpu:2 or cpu:3

Under Ubuntu 14.04 (64bit) there is only one block of cpu information:

lshw:
....
    *-cpu
...
          configuration: cores=2 enabledcores=2 threads=4
...
murxo
  • 21
  • 2
  • 1
    That's because you only have a single physical CPU with two cores and four hardware threads (hyperthreading). – Bob Sep 12 '14 at 07:47
  • I don't understand the question. The information you provided is correct. You have a single CPU with two physical cores and each support Hyperthreading. – Ramhound Sep 12 '14 at 09:19
  • 1
    Thanks Bob I wasn't aware of the ambiguous meaning of CPU. Indeed, like lscpu and proc/cpuinfo, dmesg reports 4 CPUs. Hyperthreading was enabled all the way. Meanwhile, I also found this short explanation http://superuser.com/questions/700430/what-does-2-core-4-threads-mean-in-cpu So I understand there is no configuration problem, which was my main concern. @Canadian Luke: Tried to, but not enough reputation to comment or upvote. Or is there another way? BTW as a newbie I can't see yet why it has to be a comment in order to help future visitors. Mind giving me a short explanation or a link whe – murxo Sep 12 '14 at 21:56

1 Answers1

2

That CPU has two Cores and four Threads as per the Intel ARK website:

Processor Number    i5-3210M
# of Cores  2
# of Threads    4

If you make sure HT is enabled in your bios this may change to show you four however you may have to check the output from " dmesg | grep CPU " to see the four threads..

Community
  • 1
CharlesH
  • 2,173
  • 3
  • 15
  • 18