Installation guide

Virtualization

• 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.

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.

http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/ch-Samba.html