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Thread execution now permits debugging threads individually and independently of each other; enabled
by new settings "set target-async" and "set non-stop".
14. Interoperability
14.1. Samba
Samba is a suite of programs which use NetBIOS over TCP/IP (NetBT) to enable the sharing of files,
printers and other information. This package provides a Server Message Block or SMB server (also
known as a Common Internet File System or CIFS server) which can provide network services to
SMB/CIFS clients.
Red Hat Enterprise Linux 6 provides the following significant enhancements to Samba:
Internet Protocol version 6 support (IPv6)
Support for Windows 2008 (R2) trust relationships.
Support for Windows 7 domain members.
Support for Active Directory LDAP signing/sealing policy.
Improvements for libsmbclient
Better support for Windows management tools (mmc and User Manager)
Automatic machine password changes as domain member
New registry based configuration layer
Encrypted SMB transport between Samba client and server
Full support for Windows cross-forest, transitive trusts and one-way domain trusts
New NetApi remote management and winbind client C libraries
A new graphical user interface for joining Windows Domains
Further Reading
Refer to the Deployment Guide for further information on Samba configuration on Red Hat
Enterprise Linux 6.
15. Virtualization
15.1. Kernel-based Virtual Machine
Red Hat Enterprise Linux 6 includes full support for the Kernel-based Virtual Machine (KVM) hypervisor
on the AMD64 and Intel 64 architectures. KVM is integrated into the Linux kernel, providing a
virtualization platform that takes advantage of the stability, features, and hardware support inherent in
Red Hat Enterprise Linux.
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14. Interoperability
15.1.1. Memory enhancements
Transparent Hugepages increase the memory page size from 4 kilobytes to 2 megabytes.
Transparent Hugepages provide significant performance advantages on systems with highly
contended resources and large memory workloads. Additionally, Red Hat Enterprise Linux 6 provides
support for utilizing Transparent Hugepages with KSM.
Extended Page Table age bits enables a host to make smarter choices for swapping memory under
memory pressure and allows swapping of Transparent Hugepages by breaking the extended pages
into smaller pages.
15.1.2. Virtualized CPU features
Red Hat Enterprise Linux 6 supports up to 64 virtualized CPUs for a single virtualized guest.
CPU extensions present on the host processor can now be utilized by virtualized guests. Support for
these instruction sets allow virtualized guests to take advantage of modern processor instruction
sets and hardware features.
The new x2apic virtual Advanced Programmable Interrupt Controller (APIC) improves virtualized
x86_64 guest performance by allowing direct guest APIC access and removing the overhead of
emulated access.
New user space notifiers allow the caching of CPU registers, avoiding the computationally expensive
actions of preserving register states of unused components during context switches.
Read copy update (RCU) kernel locking is now used for enhanced symmetric multiprocessing
support. RCU kernel locking provides greater performance for networking functions and multi-
processing systems.
15.1.3. Storage
Indirect ring entries (spin locks) for the para-virtualized (virtio) driver improve block I/O performance
and allows more concurrent I/O operations.
Virtualized storage devices can now be added and removed (hot plugged) from guests during
runtime.
Support for block alignment storage topology awareness. Underlying storage hardware features and
physical storage sector sizes (for example, 4KB sectors) are presented to guests. This feature
requires compatible storage device information and commands. Guest topology awareness allows
virtualized guests to optimize file system layouts and improve performance of applications using I/O
optimizations.
Performance enhancements for the qcow2 virtualized image format.
15.1.4 . Networking
MSI-X support which increases the number of interrupts available to network devices. MSI-X support
increases the performance of compatible hardware.
Virtualized network devices can now be hot plugged and hot removed from running guests. Network
boot using gpxe for more advanced PXE network booting.
15.1.5. Kernel SamePage Merging
The KVM hypervisor in Red Hat Enterprise Linux 6 features Kernel SamePage Merging (KSM), allowing [ Pobierz całość w formacie PDF ]