kernel-packages team mailing list archive

[Samantha Jian-Pielak <1338919@xxxxxxxxxxxxxxxxxx>]

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

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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

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