6 Replies Latest reply on Nov 15, 2016 2:04 PM by Intel Corporation

    Why the cores of Intel E5-2643v4 CPUs are numbered non-continuously in CentOS 7.2?

    zperry

      Yesterday, we upgraded the CPUs in two 1U servers (AIC SB122A-PH) running CentOS 7.2  to 2xE5-2643v4 3.4Ghz CPUs (Broadwell)/server.  Soon afterwards, we spotted that the cores of the 4 new CPUs are numbered non-continuously.  Instead of 0-5, now there is a gap. Please see below for /usr/bin/sensors output.

       

      Specifically, we have four such servers. fs00 and fs01 still use the existing E5-2643v3 (i.e. Haswell) 3.4Ghz CPUs. Their sensors output look fine.  fs10 and fs11 sport the Broadwell E5-2643v4 3.4Ghz CPUs, and their cores are numbered from 0-3, then jumped to 6-7, skipping 4.  This is puzzling and causes our monitoring dashboard to malfunction.  Can anyone provide us a resolution or get around to this issue?

       

      OS:

      [root@fs10 ~]# uname -a

      Linux fs10 3.10.0-327.36.1.el7.x86_64 #1 SMP Sun Sep 18 13:04:29 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

      sensors version:

      [root@fs10 ~]# rpm -qf /usr/bin/sensors

      lm_sensors-3.3.4-11.el7.x86_64

       

      $ ansible tf2:bf2 -m shell -a "/usr/bin/sensors|grep Core" -u root

      sc1u+fs00 | SUCCESS | rc=0 >>

      Core 0:         +44.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 1:         +46.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 2:         +46.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 3:         +47.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 4:         +44.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 5:         +44.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 0:         +47.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 1:         +51.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 2:         +48.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 3:         +47.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 4:         +48.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 5:         +49.0 C  (high = +80.0 C, crit = +98.0 C)

       

      sc1u+fs01 | SUCCESS | rc=0 >>

      Core 0:         +38.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 1:         +40.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 2:         +38.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 3:         +37.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 4:         +42.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 5:         +41.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 0:         +41.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 1:         +46.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 2:         +42.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 3:         +42.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 4:         +40.0 C  (high = +80.0 C, crit = +98.0 C)

      Core 5:         +42.0 C  (high = +80.0 C, crit = +98.0 C)

       

      sc1u+fs10 | SUCCESS | rc=0 >>

      Core 0:         +30.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 1:         +32.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 2:         +31.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 3:         +31.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 6:         +32.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 7:         +30.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 0:         +33.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 1:         +33.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 2:         +33.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 3:         +32.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 6:         +33.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 7:         +34.0 C  (high = +91.0 C, crit = +101.0 C)

       

      sc1u+fs11 | SUCCESS | rc=0 >>

      Core 0:         +31.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 1:         +32.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 2:         +33.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 3:         +32.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 6:         +31.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 7:         +32.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 0:         +37.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 1:         +37.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 2:         +37.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 3:         +37.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 6:         +37.0 C  (high = +91.0 C, crit = +101.0 C)

      Core 7:         +36.0 C  (high = +91.0 C, crit = +101.0 C)