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 Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1338919 Title: [F06A]The information - CPU cores is incorrect in Ubuntu14.04 cpuinfo. Status in “linux” package in Ubuntu: Confirmed Bug description: Problem Circumstances ============================== Test Case ID :9859.2 Affected System: 2 Time to Failure: Immediately Reproducible: Yes, Current Behavior ============================== Boot into Ubuntu 14.04, then type command "cat /proc/cpuinfo" to check CPU information, the information - CPU cores is incorrect, please refer to attached photo. Reference Verification ============================== 1. Which version of previous BIOS/BMC/BootUp/Runtime/HW passed? No. 2. Which similar project/product passed? No. Steps to reproduce the problem ============================== 1.Boot into Ubuntu 14.04 2.type command "cat /proc/cpuinfo" to check CPU information Expected Behavior ============================== The information - CPU cores is correct in Ubuntu14.04 cpuinfo. Config: (Intel) CPU,Haswell-EP,10 core,2.3GHz,2133,M0,LGA 2011,256KB/core,105W,25MB,QG99,933972,9.6GT/s, *2 VendorP/N: MTA18ASF1G72PZ-2G1A2KG, Memory,4FA72D9RGV,DDR4,17000 (2133MHz),8GB,Register,NA,15,by 4,1 rank, Qty:16 Model: ST900MM0006, HDD,SASII,900GB,SAS,10 Krpm,2.5 *2 USB KB/mouse AHCI QTFAMW40300028, 31F06MB00E0-B2A Ubuntu14.04 UEFI mode Intel I210 OB LAN AST2400-RKVM Quanta, Storage Card,LSISAS2208,SATA+SAS,PCI-E X8,Gen 3,Mezz card,RAID 0,1,5,6,10,50,60,8i,mini-SAS,2, Delta DPS-650SB A QTFCMW4140003 0.01 2A06 2.03 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1338919/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
