It's been noticed that the COD (cluster-on-die) is enabled in BIOS, the cpuinfo reports 5 cores instead of 10 cores. If COD is disabled, then it reports 10 cores as expected.
"Cluster On Die can be understood as if you split the CPU and LLC into two parts that behave like two CPUs in NUMA. The OS is presented two affinity domains. As a result, the latency of LLC is lowered, but the hitrate is slightly lower. However if your application is NUMA aware, data and instructions are kept close to the part of the CPU that is processing them." http://www.anandtech.com/show/8423/intel- xeon-e5-version-3-up-to-18-haswell-ep-cores-/4 ** Attachment added: "CPU_COD-enabled.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1338919/+attachment/4202432/+files/CPU_COD-enabled.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1338919 Title: [F06A]The information - CPU cores is incorrect in Ubuntu14.04 cpuinfo. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1338919/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
