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I'm running Ubuntu 14.04 on an Intel Core i7-2620m , (2.7 Ghz). I've checked in the bios that hyperthreading is activated, but on when doing less /proc/cpuinfo, hyperthreading appears off (sibling count = cpu count). Is there any specific configuration step i need to make in Ubuntu?

  • There is no cpu count metric, how are you counting the physical cores? Does siblings say 2 or 4? – Dennis Sep 23 '14 at 4:36
  • /proc/cpuinfo shows 4 cpus with id 0 to 3, and sibling 4 – user1018513 Sep 23 '14 at 4:44
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/proc/cpuinfo shows 4 cpus with id 0 to 3, and sibling 4

The Intel® Core™ i7-2620M has two physical and four virtual cores.

/proc/cpuinfo shows each virtual core as a separate processor. If you're seeing four of them, hyperthreading is working as intended.

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