Red Hat ENTERPRISE LINUX 5.4 - SYSTEMTAP LANGUAGE Manuel d'utilisateur télécharger pdf (Page 4)

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#531469

)

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#516811

). Additionally, 1:1 mapping performance has been improved (BZ#518103

Note

For detailed information on virtualization, the Virtualization Guide

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#518099

)

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.

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

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

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

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

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