
Release Notes
26
5.3. PowerPC Architectures
•
CPUFreq
, the kernel subsystem that scales CPU frequency and voltage, has been updated with
improved support for Cell Processors. This update implements a Synergistic Processing Unit (SPU)
aware CPUFreq governor that enhances the power management of Cell processors.
• Error Detection and Correction (EDAC) is now supported on the Cell Broadband Engine Architecture
in Red Hat Enterprise Linux 5.3. To enable EDAC, use the command:
modprobe cell_edac
To check this module has been added to your running kernel, check /var/log/dmesg for output like
the following:
EDAC MC: Ver: 2.0.1 Oct 4 2008
EDAC MC0: Giving out device to cell_edac MIC: DEV cbe-mic
EDAC MC1: Giving out device to cell_edac MIC: DEV cbe-mic
If correctable memory errors are encountered, the following message will be returned to the
console:
EDAC MC0: CE page 0xeff, offset 0x5700, grain 0, syndrome 0x51, row 0,
channel
0, label "":
• Debugging with hardware watchpoints using a variable that is shared between multiple threads was
causing the GNU Debugger (
GDB
) to erratically miss trigger events. The kernel has been updated to
allow
GDB
to consistently receive the watchpoint triggers, improving the reliability of the debugging
session.
5.4. x86_64 Architectures
•
kprobe-booster
is now supported on the ia64 and x86_64 architectures, allowing users to probe
kernel events much faster. This feature will also decrease the overhead caused by probing tools
(e.g. SystemTap and Kprobes) on servers running on 64-bit architecture.
• Support has been added to the kernel for the
_PTC
(Processor Throttling Control),
_TSS
(Throttling
Supported States) and
_TPC
(Throttling Present Capabilities) objects. This support, which is
part of the Advance Configuration and Power Interface specification (ACPI) provides improved
management of processor throttling.
5.5. s390x Architectures
• In zipl.conf, parameters enclosed with double quotes inside of single quotes (ie
parameters='vmhalt="LOGOFF"'
) were being parsed incorrectly. Consequently, installing the
kernel-kdump package may have failed, resulting in the error:
grubby fatal error: unable to find a suitable template
Summary of Contents for ENTERPRISE LINUX 5.3 - RELEASE MANIFEST
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