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
Citrix CEO Mark Templeton plans to retire

July 30th, 2015

On July 28 Citrix disclosed that Mark Templeton, the company CEO, has plans to retire after over 20 years of service, an unexpected news that drew attention on the next…

Citrix announces Q2 2015 results

July 30th, 2015

Citrix announced its financial results for second quarter 2015.
The revenues for the second quarter were $797 million for an increase of 2% compared to Q2 2014.
Net income was $103…

VMware announces results for Q2 2015

July 24th, 2015

VMware released the results about its results for Q2 2015.
VMware, announced a GAAP total revenue growth of $1.52 billion, for an increase of 4 percent compared to Q2 2014. License revenues…

Gartner releases its 2015 Magic Quadrant for x86 Server Virtualization Infrastructure

July 21st, 2015

Gartner released its Magic Quadrant for x86 Server Virtualization Infrastructure for year 2015, once more positioning VMware and Microsoft in the leaders Quadrant.
No surprises in the leaders quadrant, as…

Release: Parallels Mac Management 4.0 for Microsoft SCCM

July 21st, 2015

Parallels announced the availability of Parallels Mac Management 4.0 for Microsoft System Center Configuration Manager (SCCM), extending its range of capabilities to Mac computers.
This new release increases the flexibility…

Avast Software Acquires Remotium

July 10th, 2015

On July 8, Avast Software, a Czech private limited company provider of antivirus and security software products announced to have acquired Silicon Valley based Remotium, a company founded in…

Release: Oracle VM VirtualBox 5.0 Candidate 1 (RC1)

July 8th, 2015

Oracle has announced to have released version 5.0 Candidate 1 (RC1) for its virtualization platform VM VirtualBox. The release brings enhancement and bug fixes to the previous versions, improving stability…

IBM announces Docker Based Container Services

July 1st, 2015

Containers continue to gain traction, IBM announced the release of enterprise class containers based on Docker and built on its Platform as a Service, Bluemix for hybrid environments. It will…

Release: Xen Project Hypervisor 4.5.1

July 1st, 2015

The Xen Project, the community which develops the Xen hypervisor under the GNU General Public License (GPLv2) announced the availability of a new maintenance release, version 4.5.1 of the Xen…

Red Hat Summit 2015 Wrap-up

June 29th, 2015

Last week, Red Hat held its premiere event in Boston, Massachusetts from June 23 to 26, the Red Hat Summit,  where several announcements have been made.
The summit offered over…

Midokura expands OpenStack Team with Takashi Yamamoto

June 29th, 2015

Network virtualization is one of the hot topics within the OpenStack community. Last week japanese startup Midokura focused on network virtualization announced the assignment of Takashi Yamamoto as OpenStack…

Red Hat announces Q1 2015 earnings

June 24th, 2015

On June 18 Red Hat announced its financial results for its fiscal year 2016 and for the first quarter of 2015.
Total revenue for the first quarter ended May 31,…

Rancher Labs raises $10M in Series A funding

June 11th, 2015

Rancher Labs is a startup providing management on top of the Docker containers, today the company has announced that it has raised $10 million in a series A funding…

EMC acquires Virtustream

May 26th, 2015

EMC has acquired Virtustream, a Infrastructure as a Service (IaaS) provider originally funded among the others from SAP for 1.2 billion US dollars. Virtustream also provides a Cloud Management Platform…

 
Monthly Archive