Release Notes

Applies to: Red Hat Enterprise Linux 7.2
Cause:
Irq balancer scans the isolcpus and nohz_full kernel masks and adds the corresponding CPUs to the
banned_cpus mask. This works fine for valid masks, but not for the default, emtpy masks. In this case
when they read from the sysfs they return empty strings,
"\n" or "0x0, \n":
Workaround:
A workaround is to uncomment the following from /etc/sysconfig/irqbalance:
#IRQBALANCE_BANNED_CPUS=
Coretemp driver adds a limited number of cores
Description: On the Dell EMC PowerEdge servers with the Intel Xeon Phi processor 72xx product family installed with
Red Hat Enterprise Linux 7.2 (kernel-3.10.0-327.36.1.el7 or later), the coretemp driver fails to add more
than 32 cores.
Applies to: Red Hat Enterprise Linux 7.2 with kernel-3.10.0-327.36.1.el7 or later versions
Cause: The coretemp driver permits reading the Digital Temperature Sensor (DTS) embedded inside Intel CPUs.
In kernel-3.10.0-327.36.1.el7, the coretemp drivers support only up to 32 cores. This prevents adding the
other remaining cores.
Workaround: There is no workaround that is currently available for this issue.
Turbostat displays incorrect information
Description:
The Turbostat tool in Red Hat Enterprise Linux 7.2 displays incorrect information regarding the C-states
and %Busy parameters for the Intel Xeon Phi processor 72xx product family.
Applies to: Red Hat Enterprise Linux 7.2
Cause: The Turbostat tool in Red Hat Enterprise Linux 7.2 does not have the required fix to support the Intel
Xeon Phi processor 72xx product family.
Workaround: There is no workaround that is currently available for this issue.
Ethtool reports a lower port speed
Description:
On the PowerEdge servers installed with Red Hat Enterprise Linux 7.3, the Mellanox ConnectX-4 100 GbE
Ethernet adapter link speed is reported as 40 GbE instead of 100 GbE.
Applies to: Red Hat Enterprise Linux 7.3
Cause: The Mlx5 driver does not have the patches that are required to identify the port speed as 100 GbE speed.
Workaround: This error message can be ignored because there is no functionality loss.
Red Hat Enterprise Linux 7.3 displays an error
message for drivers
Description:
After successful installation of Red Hat Enterprise Linux 7.3, the system displays the following driver-
related error message in /var/log/messages:
Known issues 33