RHBA-2014:1422 - Bug Fix Advisory

Topic

Updated cpupowerutils packages that fix several bugs and add one enhancement are
now available for Red Hat Enterprise Linux 6.

Description

The cpupowerutils packages provide a suite of tools to manage power states on
appropriately enabled central processing units (CPU).

This update fixes the following bugs:

• Prior to this update, the turbostat utility did not correctly access the

energy status register on certain Intel Core processors. As a consequence,
turbostat displayed the following error message:

/dev/cpu/0/msr offset 0x641 read failed

With this update, turbostat has been fixed to correctly access the proper energy
status registers. As a result, turbostat now returns the expected data in the
described scenario. (BZ#1056310, B#1080631)

• Previously, on systems using the ACPI CPU frequency driver, the cpupower

utility displayed the CPU frequencies rounded to two digits even though the
frequencies values were of 3 digits. This behaviour could lead to various
problems with scripts using this output. To fix this bug, the "--no-rounding"
option has been added to cpupower and the output can now be reliably used by
following scripts and applications. (BZ#1109187)

In addition, this update adds the following enhancement:

• This update adds support for the Intel Broadwell Microarchitecture to the

turbostat utility. (BZ#1093513)

Users of cpupowerutils are advised to upgrade to these updated packages, which
fix these bugs and add this enhancement.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 6 x86_64
• Red Hat Enterprise Linux Server 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support 6 i386
• Red Hat Enterprise Linux Workstation 6 x86_64
• Red Hat Enterprise Linux Workstation 6 i386
• Red Hat Enterprise Linux Desktop 6 x86_64
• Red Hat Enterprise Linux Desktop 6 i386
• Red Hat Enterprise Linux for Power, big endian 6 ppc64
• Red Hat Enterprise Linux for Scientific Computing 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 x86_64
• Red Hat Enterprise Linux Server from RHUI 6 i386
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support Extension 6 i386

Fixes

CVEs

(none)

References

(none)