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Xen 4.3 Brings ARM Support, Better Performance

Virtualization

Published on 09 July 2013 11:25 AM EDT
Written by Michael Larabel in Virtualization
1 Comment

The Xen Project, now under the stewardship of the Linux Foundation, has released the feature-bearing Xen 4.3.

One of the big features of Xen 4.3 includes initial ARM support via the ARMv7-A virtualization extensions as well as the ARMv8 architecture. The ARMv7 support has been tested on the Arndale Board, Samsung Chromebook, ARM Fast Models, and ARM Versatile Express. The ARMv8 testing for now was just done on ARM Fast Models until there's actual 64-bit ARM hardware available.

Xen 4.3 performance enhancements come in the form of NUMA scheduler affinity to benefit NUMA hardware, scalability improvements so physical RAM can now be up to 16TB in size rather than 5TB, and a limitation of 300 virtual CPUs was removed so Xen 4.3 can now accomodate 750 virtual CPUs.

Xen 4.3 also provides better security via vTPM enhancements and the XSM/Flask security subsystem.

Other features include tooling improvements, usability improvements, better power efficiency, Intel vAPIC support, support for newer VIA CPUs, ACPI v5 support, and many other features. This release does away with 32-bit and IA64 support.

More details on Xen 4.3 virtualization can be found via its Wiki feature list and release notes.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
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