Red Hat ENTERPRISE 5.3 RELEASE NOTES Guía de instalación descargar pdf (Pagina 26)

Microarchitecture (Nehalem). Consequently, the performance monitoring unit could not be used and

the processor fell back to the timer interrupt. T he kernel has been updated to resolve this issue.

Support has been added to the kernel for the CPU power state, C3, on the Next-Generation Intel

Microarchitecture (Nehalem). T he ability to enter C3 (also known as the sleep state) improves the

power efficiency of the CPU when idle.

Previously, the MAX_ARG_PAGES limit that is set in the kernel was too low, and may have resulted in

the following error:

execve: Argument list too long

In this update, this limit has been increased to 25 percent of the stack size, which resolves this

issue.

autofs4 updates have been backported to Red Hat Enterprise Linux 5.3 from linux kernel version

2.6.27.

Red Hat Enterprise Linux 5.3 now includes the ability to specify that core files be piped to a forked

copy of a user space application, rather than directly to a file. This is enabled by placing |

path/to/applicationin /proc/sys/kernel/core_pattern. When a core is dumped, a copy of

the specified application will be executed, and the core will be piped to it on stdin. This allows for the

core to be augmented, analyzed and actively handled at core dump time.

The file /proc/cpuinfo now reports the ID of the Advanced Programmable Interrupt Controller

(APIC) that is used by each individual CPU.

The Machine Check Exception (MCE) kernel subsystem has been enhanced to support larger

memory configurations as needed by new systems.

The mount command now supports Kerberos authentication when mounting filesystems via Samba.

The sec=krb5 or sec=krb5i switch allows the kernel to call a userspace application

(cifs.upcall) which returns a SPNEGO (Simple and Protected GSSAPI Negotiation Mechanism)

security blob (Binary Large OBject). The kernel can then use this blob to authenticate with the server

and mount the requested filesystem.

If you configured the kernel parameter kernel.unknown_nm i_panic on a system that used the

IOAPIC NMI watchdog method, a kernel panic could occur. This is because the NMI watchdog could

not disable the source of NMIs securely.

With this release, the NMI watchdog code has been revised to allow users to safely disable the NMI

source. As such, you can now safely configure the kernel parameter

kernel.unknown_nm i_panic on systems that use the IOAPIC NMI watchdog method.

5.2. x86 Architectures

The powernowk8 driver was not performing sufficient checks on the number of running CPUs.

Consequently, when the driver was started, a kernel oops error message may have been reported. In

this update the powernowk8 driver verifies that the number of supported CPUs (supported_cpus)

equals the number of online CPUs (num_online_cpus), which resolves this issue.

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: m odprobe cell_edac

To check this module has been added to your running kernel, check /var/log/dmesg for output like

5. Kernel-Related Notes

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 208 209

Comentarios a estos manuales

Sin comentarios

Red Hat ENTERPRISE 5.3 RELEASE NOTES Guía de instalación Pagina 26

Comentarios a estos manuales

Relacionado con productos y manuales para Teléfonos Red Hat ENTERPRISE 5.3 RELEASE NOTES