Red Hat ENTERPRISE LINUX 5.5 - S 2010 Mode d’emploi

Red Hat Enterprise

Linux 5.5

Release Notes

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Release Notes

Abstract

Red Hat Enterprise Linux minor releases are an aggregation of individual enhancement, security and

bug fix errata. The Red Hat Enterprise Linux 5.5 Release Notes documents the major changes made

to the Red Hat Enterprise Linux 5 operating system and its accompanying applications for this minor

release. Detailed notes on all changes in this minor release are available in the Technical Notes.

Highlights of the Red Hat Enterprise Linux 5.5 release include hardware enablement for the Intel

Boxboro-EX platform, AMD Magny-Cours processor and IBM Power 7 processor. Virtualization is

improved, with support for multiple 10 GigE SR-IOV cards, and automatic usage of hugepages for

virtual guest memory when enabled on the system. Interoperability improvements include updates to

OpenOffice for Microsoft Office 2007 filters, Samba for Windows 7 compatibility and boot support for

virtual machines using Microsoft based PXE services.

1. Installation .............................................................................................................................. 2

2. Virtualization ........................................................................................................................... 3

3. Kernel .................................................................................................................................... 4

3.1. Kernel Platform Enablement ......................................................................................... 4

3.2. Kernel Generic Features ............................................................................................... 5

4. Device Drivers ........................................................................................................................ 5

4.1. Network Device Drivers ................................................................................................ 6

4.2. Storage Device Drivers ................................................................................................. 7

5. Filesystem/Storage Management ............................................................................................. 9

6. Tools ...................................................................................................................................... 9

6.1. GNU Project debugger (GDB) ....................................................................................... 9

6.2. SystemTap ................................................................................................................. 10

6.3. Valgrind ..................................................................................................................... 10

7. Desktop Updates .................................................................................................................. 11

8. New Packages ...................................................................................................................... 11

A. Revision History 12

1. Installation

Red Hat Enterprise Linux 5.5 introduces many bugfixes and enhancements to the system installer

(anaconda).

The interactive installer has been enhanced, adding the abilty to specify additional Network File

System (NFS) mount options when installing from an NFS source (BZ#4930521). Additionally, install

sources (e.g. kickstart files) located on password protected File Transport Protocol (FTP) servers can

now be retrieved during installation (BZ#5054242).

Kickstart

Kickstart provides a way for users to automate a Red Hat Enterprise Linux installation. Using kickstart,

a system administrator can create a single file containing the answers to all the questions that would

normally be asked during a typical installation.

Kickstart debugging and error reporting has been improved. The installer now retains kickstart

scriptlets during debugging, logs standard output (stdout) and standard error (stderr) streams, and

logs error messages to anaconda.log (BZ#5106363).

1 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=493052

2 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=505424

3 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=510636

Virtualization

Package groups can now be excluded in a kickstart installation in the same manner that individual

packages are excluded (BZ#5585164). Additionally, the bootloader command now supports the --

hvargs parameter, allowing Xen hypervisor arguments to be specified during a kickstart installation

(BZ#5014385).

Previously, the kickstart installation method offered two options to select all packages @Everything

and * (wildcard). As of Red Hat Enterprise Linux 5.5, both of these options have been deprecated.

Attempting to use a select all packages option will fail, unless the kickstart file also includes package

negation for conflicting packages. Therefore, to install all packages but conflicting packages, the

kickstart file must contain:

%packages

@Everything

-@Conflicts

Red Hat Enterprise Linux 5.5 includes the new package sets samba3x, freeradius2, postgres84.

These package sets are only available via kickstart during system installation or through yum for

existing systems.

Hardware Support

The following device drivers are now supported during installation:

• the pmcraid driver for PMC Sierra MaxRAID Controller Adapters (BZ#5327776)

• the ibmvfs driver for Power6 Virtual FC devices (BZ#5122377).

• the bfa driver for Brocade Fibre Channel to PCIe Host Bus Adapters (BZ#4757078)

• the be2iscsi driver for ServerEngines BladeEngine 2 Open iSCSI devices (BZ#5294429).

Note

For detailed information on installation, the Installation Guide10 documents how to install

Red Hat Enterprise Linux 5.

2. Virtualization

Red Hat Enterprise Linux 5.5 delivers many updates to virtualization. Detailed notes on all the

changes to virtualization components are available in the Technical Notes11.

Note

Management of KVM based virtual guests using Cluster Suite is now fully supported.

4 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=558516

5 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=501438

11 http://redhat.com/docs

Release Notes

SPICE

Red Hat Enterprise Linux 5.5 includes components providing functionality for the Simple

Protocol for Independent Computing Environments (SPICE) remote display protocol.

These components, are for use in conjunction with Red Hat Enterprise Virtualization

products and are not guaranteed to have a stable ABI. The components will be updated

to synchronize with functional requirements of Red Hat Enterprise Virtualization products.

Migration to future releases may require manual operations on a per-system basis.

PCI passthrough improvements

PCI passthrough allows PCI devices to appear and behave as if they were physically attached to the

guest operating system. KVM and Xen hypervisors both support attaching PCI devices on the host

system to virtualized guests.

The AMD input/output memory management unit (IOMMU) kernel driver, which assists in PCI

passthrough, has been updated. This update fixes an issue where system management requests were

handled incorrectly. (BZ#53146912)

Support for PCI passthrough using Intel VT-d extensions on the KVM hypervisor has been improved.

Devices (either physical or virtual) can now be shutdown and unassigned from a guest during runtime,

allowing the device to be reassigned to another guest. This reassignment can also be carried out live

(BZ#51681113). Additionally, 1:1 mapping performance has been improved (BZ#51810314).

Note

For detailed information on virtualization, the Virtualization Guide15 is the definitive guide

for virtualization on Red Hat Enterprise Linux.

HugePages Support

New rules are available in libvirt to enable hugetlbfs (HugePages). When a system is configured

with Hugepages, libvirt automatically allocates memory from hugetlbfs to back the virtual guest

memory. When combined with extended page tables and nested page tables in hardware, significant

performance improvements can be achieved by the guest. (BZ#51809916)

3. Kernel

3.1. Kernel Platform Enablement

This release introduces support for Intel's new platforms, code-named Boxboro-EX and Boxboro-

MC, AMD's new processor family, code-named Magny-Cours and IBM's Power7 processor.

12 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=531469

13 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=516811

14 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=518103

16 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=518099

Kernel Generic Features

3.2. Kernel Generic Features

The recommended minimal memory requirement on x86 and x86_64 for Red Hat Enterprise Linux 5.5

is now 1GB per logical CPU.

Note

A logical CPU is defined as any entity that can be scheduled (i.e. every core or thread in a

multi-core or multi-thread processor is defined as a logical CPU).

Detecting kernel tasks stuck in the uninterruptible sleep state

In some circumstances, tasks in the kernel may permanently enter the uninterruptible sleep state (D-

State), making the system impossible to shut down. With this update, the Detect Hung Task kernel

thread has been added, providing the ability to detect tasks permanently stuck in the D-State.

This new feature is controlled by the CONFIG_DETECT_HUNG_TASK kernel flag. When set

to "y" tasks stuck in the D-State are detected; when set to n it is off. The default value for the

CONFIG_DETECT_HUNG_TASK flag is y.

Additionally, the CONFIG_BOOTPARAM_HUNG_TASK_PANIC flag has been added. When set to y,

a kernel panic is triggered when a task stuck in the D-State is detected. The default value for the

CONFIG_BOOTPARAM_HUNG_TASK_PANIC flag is n.

BZ#50605917

Signed s390 Kernel Modules

Starting at Red Hat Enterprise Linux 5.5, all s390 kernel modules are now signed. BZ#48366518

BZ#45618119, BZ#44813020, BZ#42770921

4. Device Drivers

the hpilo driver for HP iLO/iLO2 management processors has been updated.

The Advanced Linux Sound Architecture (ALSA) has been updated — providing enhanced support for

High Definition Audio (HDA). (BZ#52539022).

the i2c device driver for the iic-bus interface has been updated with support for the SB900 SMBus

controller. (BZ#51662323)

the mlx4 driver for Mellanox ConnectX HCA InfiniBand devices has been updated to version 1.4.1

(BZ#51414724 BZ#50034625)

17 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=506059

18 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=483665

19 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=456181

20 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=448130

21 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=427709

22 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=525390

23 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=516623

24 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=514147

Release Notes

4.1. Network Device Drivers

Wireless Rebase

Red Hat Enterprise Linux 5.5 contains a major updates to wireless drivers and subsystems in the

kernel.

The iwlwifi drivers for Intel wireless network adapters have been updated. Devices in this hardware

line support 802.11a, 802.11b, 802.11g, and 802.11n wireless protocols. This update provides new

support for iwl6000 and iwl1000 devices, and enhanced support for iwl5000, iwl4965 and

iwl3945 devices.

The rt2x00 drivers for wireless devices has been updated. This update refreshes the drivers for the

Ralink rt2400pci, rt2500pci, rt2500usb, rt61pciand rt73usb chipsets, and the drivers for

the rtl8180 and rtl8187 Realtek chipsets.

The ath9k driver for Atheros 802.11n wireless LAN adapters has been enabled.

To support the features of these drivers, the mac80211 and cfg80211 kernel subsystems have been

updated.

Solarflare driver

In Red Hat Enterprise Linux 5.5, the Solarflare driver (sfc) has been added (BZ#44885626)

Neterion's X3100 Series 10GbE PCIe driver

The vxge driver for Neterion's X3100 Series 10GbE PCIe devices has been updated

(BZ#45368327).

ServerEngines BladeEngine2 10Gbps driver

the be2net driver for ServerEngines BladeEngine2 10Gbps network devices has been updated

(BZ#54946028)

Cisco 10G Ethernet Driver

the enic driver for Cisco 10G Ethernet devices has been updated to version 1.1.0.100.

(BZ#51908629 BZ#55014830)

QLogic 10 Gigabit PCI-E Ethernet Driver

the qlge driver for QLogic 10 Gigabit PCI-E ethernet devices has been updated to version

1.00.00.23. (BZ#51945331)

Broadcom Tigon3 ethernet devices

the tg3 driver for Broadcom Tigon3 ethernet devices has been updated. (BZ#51531232)

Intel Gigabit Ethernet Network Devices

the igb driver for Intel Gigabit Ethernet Network devices has been updated. (BZ#513710)33

25 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=500346

26 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=448856

27 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=453683

28 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=549460

29 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=519086

30 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=550148

31 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=519453

32 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=515312

33 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=513710

Storage Device Drivers

Intel 10 Gigabit PCI Express Network Devices

the ixgbe driver for Intel 10 Gigabit PCI Express Network devices has been updated.

(BZ#513707,34 BZ#514306,35 BZ#516699)36

Intel PRO/1000 Network Devices

The e1000 driver for Intel PRO/1000 network devices has been updated (BZ#51552437)

NetXen Multi port (1/10) Gigabit Network Devices

The netxen driver for NetXen Multi port (1/10) Gigabit Network devices has been updated.

(BZ#54274638)

Broadcom Everest network devices

The bnx2x driver for Broadcom Everest network devices has been updated to version

1.52.1-5.(BZ#51571639, BZ#522600)40

Broadcom NetXtreme II network devices

The bnx2 driver for Broadcom NetXtreme II network devices has been updated to version

2.0.2(BZ#517377)41

Broadcom NetXtreme II iSCSI

The bnx2i driver for Broadcom NetXtreme II iSCSI has been updated. (BZ#516233)42

RealTek 8169 ethernet driver

the r8169 driver for RealTek 8169 ethernet devices has been updated. (BZ#51458943)

4.2. Storage Device Drivers

QLogic Fibre Channel Host Bus Adapter Driver

the qla2xxx driver for QLogic Fibre Channel HBAs has been updated to version 8.03.01.04.05.05-k

(BZ#51944744 BZ#54283445 BZ#54305746)

HighPoint RocketRAID 3xxx/4xxx

The hptiop driver for HighPoint RocketRAID 3xxx/4xxx controllers has been updated, adding support

for RR44xx adapters. (BZ#519076)47

34 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=513707

35 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=514306

36 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=516699

37 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=515524

38 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=542746

39 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=515716

40 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=522600

41 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=517377

42 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=516233

43 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=514589

44 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=519447

45 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=542834

46 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=543057

47 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=519076

Release Notes

Emulex Fibre Channel Host Bus Adapter Driver

The lpfc driver for Emulex Fibre Channel HBAs has been updated to version 8.2.0.63.3p.

(BZ#515272)48 BZ#54976349

LSI SAS-2 family of adapters

The mpt2sas driver that supports the SAS-2 family of adapters from LSI has been updated to version

02.101.00.00. This update fixes many issues, most notably:

• Sanity checks have been added when volumes are added and removed, ignoring events for foreign

volumes.

• driver is now legacy I/O port free

• An issue that may have resulted in a kernel oops at hibernation or resume has been fixed.

(BZ#516702)50

LSI Fusion MPT

The mptque base driver for devices using LSI Fusion MPT firmware has been updated to version

3.4.13rh. This update fixes many issues, most notably:

• The serial attached SCSI (SAS) topology scan has been restructured, adding expander, link status

and host bus adapter (HBA) events.

• Intermittent issues caused by SAS cable removal and reinsertion have been fixed.

• An issue where SATA devices received different SAS addresses has been fixed.

• The device firmware now reports the queue full event to the driver and the driver handles the queue

full event using the SCSI mid-layer.

(BZ#516710)51

LSI MegaRAID SAS controllers

The megaraid_sas driver for LSI MegaRAID SAS controllers has been updated to version 4.17-RH1.

This update fixes many issues, most notably:

• An issue during firmware boot and initialization has been fixed.

• An issue that resulted in devices hanging during hibernation has been fixed.

• The driver now auto updates the device when added or deleted.

• MegaRAID SAS driver is now legacy I/O port free

BZ#51824352

48 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=515272

49 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=549763

50 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=516702

51 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=516710

52 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=518243

Filesystem/Storage Management

5. Filesystem/Storage Management

Improved CFQ I/O scheduler performance

Some applications (e.g. dump and nfsd) try to improve disk I/O performance by distributing I/O

requests to multiple processes or threads. However, when using the Completely Fair Queuing (CFQ) I/

O scheduler, this application design negatively affected I/O performance. In Red Hat Enterprise Linux

5.5, the kernel can now detect and merge cooperating queues. Additionally, the kernel can also detect

if the queues stop cooperating, and split them apart again.

New GFS2 mount option

This update introduces GFS2 support for the errors= mount command line option, which may

assist in troubleshooting. The default option, errors=withdraw results in the filesystem attempting

to withdraw from the cluster if an I/O error or metadata error is encountered. The alternative,

errors=panic results in a panic in the same situation. (BZ#51810653)

CIFS Update

The Common Internet File System (CIFS) has been updated in the kernel. (BZ#50083854)

6. Tools

6.1. GNU Project debugger (GDB)

The GNU Project debugger (normally referred to as GDB) debugs programs written in C, C++, and

other languages by executing them in a controlled fashion, and then printing out their data.

In Red Hat Enterprise Linux 5.5, GDB has been updated to version 7.0.1. For a detailed listing of

changes refer to the GDB section of the Technical Notes.

Enhanced C++ support

Support for the C++ programming language in GDB has been improved. Notable improvements

include:

• Many improvements to expression parsing.

• Better handling of type names.

• The need for extraneous quoting has nearly been eliminated

• "next" and other stepping commands work properly even when the inferior throws an exception.

• GDB has a new "catch syscall" command. This can be used to stop the inferior whenever it makes a

system call.

Wide and multi-byte character support

GDB now has support for wide and multi-byte characters on the target.

53 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=518106

54 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=500838

Release Notes

Independent thread debugging

Thread execution now permits debugging threads individually and independently of each other;

enabled by new settings "set target-async" and "set non-stop".

6.2. SystemTap

SystemTap is a tracing and probing tool that allows users to study and monitor the activities of the

operating system (particularly, the kernel) in fine detail. It provides information similar to the output of

tools like netstat, ps, top, and iostat; however, SystemTap is designed to provide more filtering and

analysis options for collected information.

New Kernel Tracepoints

Tracepoints are placed in important sections of the kernel, allowing system administrators to analyze

the performance of, and debug portions of code. In Red Hat Enterprise Linux 5.5, a wide range

of tracepoints have been added to the kernel (BZ#475710)55, including tracepoints for networking

(BZ#475457)56, coredump (BZ#517115)57 and signal (BZ#517121)58.

Note

A list of tracepoints available in the kernel can be obtained with:

stap -L 'kernel.trace("*")'|sort

Unprivileged mode

Previously, only users with root privileges were able to use SystemTap. This update introduces

SystemTap's unprivileged mode, allowing non-root users to still use SystemTap. Detailed information

on unprivileged man stap-client manpage.

Important

Unprivileged mode is considered a Technology Preview in the Red Hat Enterprise

Linux 5.5. The stap-server facility on which it relies is undergoing work for security

improvements and should be deployed with care on a trustworthy network.

C++ Probing

The C++ program probing improvements also allows better probing of user-space programs.

6.3. Valgrind

Valgrind is used to monitor memory read, write, and allocation operations. The valgrind tool is

frequently used by developers to diagnose and debug memory management problems.

55 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=475710

56 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=475457

57 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=517115

58 https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=517121

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