RHBA-2014:0394 - Bug Fix Advisory

Topic

Updated cpuspeed packages that fix one bug are now available for Red Hat
Enterprise Linux 5.

Description

The cpuspeed packages contain a daemon that dynamically changes the speed of
processors depending upon their current workload. This package also allows users
to enable CPU frequency scaling using in-kernel CPUfreq governors on Intel
Centrino and AMD Athlon64/Opteron platforms.

This update fixes the following bug:

• Previously, certain AMD processors were not entirely compatible with the CPU

frequency scaling. As a consequence, a kernel panic could occur on some
AMD-based Hardware Virtual Machine (HVM) guests when CPU frequency scaling was
enabled. With this patch, the default CPU governor value has been set to
"performance", which prevents this problem. Thus, unless the user changes the
CPU governor setting, the kernel now no longer panics when CPU frequency scaling
is enabled on HVM guests. (BZ#1078211)

Users of cpuspeed are advised to upgrade to these updated packages, which fix
this bug.

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/site/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

CVEs

(none)

References

(none)