Ballooning is more than enough to do memory overcommit on Xen Oracle says

Posted by virtualization.info Staff   |   Wednesday, August 27th, 2008   |  

The capability to overcommit memory is something that VMware offers on its hypervisor ESX since a long time. It’s achieved by several techniques (ballooning, contend-based page sharing, demand paging) and the company uses it as a great selling point.

At the moment only one of the approaches used by VMware is also implemented by several competitors: the memory ballooning.
This feature comes as part of Xen (only for Linux guest OS at the moment) so any commercial hypervisor powered by Xen can offer it, including Citrix XenServer, Virtual Iron, Oracle VM and the operating systems from Novell and Red Hat.

Oracle is a contributor of the open source hypervisor and just before the release of Xen 3.3 decided to clarify that there’s no need to implement all the techniques that VMware: some improvements to the current Xen ballooning can grant a just fine memory overcommitment.

At the XenSummit 2008 Dan Magenheimer, Consulting Developer at Oracle (and once Principal Scientist of Virtualization Research at HP), presented a lecture and a whitepaper clarifying the point:

…While content-based page-sharing, VMM-based demand paging, and hotplug memory are all glamorous mechanisms that can be used to improve memory efficiency, the simple existing balloon driver provided by Xen, when combined with gray-box data collected by a few scripts, is sufficient to implement reasonable memory overcommit. More measurement and testing is ongoing in Oracle’s OnDemand group, but we believe that this very simple solution delivers the vast majority of the value of memory overcommit with a much smaller cost…


Labels:

blog comments powered by Disqus


virtualization.info Newest articles
Release: VMware vCloud Suite 7 and vRealize Suite 7

February 11th, 2016

Yesterday VMware announced version 7 of both its vCloud and vRealize suites, confirming its efforts to be relevant in the CMPs (Cloud Management Platforms) space.
vRealize Suite 7 is made…

Platform9 adds Multi-Region & Multi-Hypervisor management into Managed OpenStack

February 11th, 2016

Platform9 solutions leverages a mix of SaaS and on premises Virtual Appliance to provide into supported environments capabilities typical of Cloud Management Platforms (CMPs) such self-service provisioning, monitoring, configuration…

VMware announces vRealize Log Insight 3.3

February 10th, 2016

Log Insight is a log aggregation, management and analisys tool, that VMware first introduced in 2013 and now is fiercely competing against Splunk.
Today the company announced Log Insight 3.3…

Microsoft releases Azure Stack TP1

February 1st, 2016

During Ignite 2015, back in September, Microsoft announced Microsoft Azure Stack as the building block for its hybrid cloud strategy.
What Microsoft is saying with this move is that, despite…

Release: Ansible 2.0

January 14th, 2016

Ansible is an IT automation tool especially popular within the developers’ community, thanks to its simplicity and agentless nature.
Three months away from its acquisition by Red Hat the company announced…

Nutanix goes Public

December 23rd, 2015

Nutanix is a provider of converged infrastructure, basically a physical server containing both compute and storage driven by an Installed Hypervisor of choice, this server, called a node can…

Release: VMware vRealize Automation 7 and VMware vRealize Business Standard 7

December 23rd, 2015

Last week VMware finally completed the first major update of VMware vRealize Suite, its well known cloud management solution, releasing in GA both vRealize Automation 7 and vRealize Business Standard…

WhatMatrix.com goes Live

December 15th, 2015

virtualization.info has been following Virtualization Matrix since its early steps and we recently wrote about its crowdsourced-powered heir: WhatMatrix.
Today we are happy to report that its community, formed…

Microsoft loves Red Hat: The business implications

November 18th, 2015

As you may have heard, Microsoft recently announced its “historical” partnership with Red Hat, something that a number of analysts already claimed as a milestone for both companies but especially for…

Red Hat acquires Ansible

October 16th, 2015

Today Red Hat announced that it has signed a definitive agreement to acquire Ansible, provider of an IT automation tool popular especially within the developers’ community.
The acquisition is rumored…

Dell acquires EMC, owner of VMware and Pivotal

October 12th, 2015

Dell today announced that it signed a definitive agreement to acquire EMC Corporation for a total of $67 billion, making it the largest ever acquisition in the technology industry so…

Red Hat announces earnings for Q2 2015

October 2nd, 2015

Red Hat announced its financial results for the second quarter of fiscal year 2016.
Total revenue for the second quarter ended Augus 31, 2015 was $504 million, with an increase…

Citrix retires XenClient

September 21st, 2015

Citrix on its website announced that it started the End-of-Life process of Citrix XenClient Enterprise, the end of life date will be December 12, 2016.
XenClient consists of two technologies,…

Release: Altaro VM Backup V6

September 9th, 2015

Altaro Software, company specialized in backup for virtualized environments, specifically Microsoft Hyper-V, announced the release of Altaro VM Backup, previously known as Altaro Hyper-V Backup, rebranded to introduce VMware…

 
Monthly Archive