Tech: Hyper-V CPU Scheduling

Posted by Kenneth van Surksum   |   Monday, February 28th, 2011   |  

Ben Armstrong, who is Virtualization Program Manager at Microsoft posted a four part article about CPU scheduling in Hyper-V. Most of the aspects of the Hyper-V CPU scheduler come into play when all of the CPU resources on a physical computer are being used, called ” contention for resource” and Hyper-V has to decide who wins and who loses when new resources are requested. Each option is detailed, and pros and cons are provided.

When defining a VM within Hyper-V the following Processor options are available:

Virtual Machine Reserve – covered in part one of the four part article and covers the lower bound of the CPU resource. It is configured as a total possible CPU usage of a VM, the VM will not boot if the necessary percentage of CPU usage isn’t available and the VM will allways get its CPU percentage when needed while booted.

Virtual Machine limit – covered in part two which covers the upper bound of the CPU resource and is also configured as a percentage of total CPU usage of a VM. It states that the VM will never be allowed to use more than the specified percentage of its virtual processors. Which can help with poorly written applications which consumes all the available CPU resources.

Relative Weight – covered in part three defines how CPU is handled between the lower and the upper bound of the CPU resource. It is a number between 1 and 10,000 and which comes into effect when there is a contention for CPU resource on the host. The height of the weight determines the share of the system resource the VM receives. Using this setting VMs can be marked as important and not-important in a mixed production and development/staging environment.

clip_image001

Part four covers some Frequently Asked Questions based on the described options, like why a percentage is used for limit and reserve and not Mhz/Ghz.


Labels: ,

blog comments powered by Disqus


virtualization.info Newest articles
Release: VMware vRealize Log Insight 4.5

June 13th, 2017

Log Insight is a log aggregation, management and analysis tool, that VMware first introduced in 2013 and considered a competitor of Splunk.
Yesterday VMware announced the release of version 4.5, available for…

Release: VMware vRealize Automation 7.3

June 6th, 2017

Today VMware announced the latest release of its cloud management platform vRealize Automation, former vCloud Automation Center.
VMware vRealize Automation 7.3 release notes can be found at this link.

The…

Paper: Introducing the NSX-T Platform

February 9th, 2017

“We see greater potential strategic opportunity in NSX over the next decade than our franchise product vSphere has had for the past decade.”
said VMware’s CEO Pat Gelsinger talking about…

Paper: VMware vSphere Virtual Machine Encryption Performance

November 22nd, 2016

Encryption of virtual machines is something that has been requested for years by the security community. VMware continued to postpone its implementation due to the negative operational impact that many…

Quest Software leaves Dell

November 1st, 2016

In September 2012 Dell announced to have completed the acquisition of Quest Software, a Californian company with an history in systems management, security, business intelligence and, falling back in our…

Citrix announces Q3 2016 results

October 21st, 2016

Citrix announced its financial results for third quarter 2016.
The revenues for the second quarter were $841 million for an increase of 3% compared to Q3 2015.
Net income was $132…

Release: VMware vSphere 6.5 & Virtual SAN 6.5

October 19th, 2016

2016 edition of VMworld US has been quite turbulent, on the other hand during VMworld Europe, happening these days in Barcelona, the company announced a few more products for the…

Release: VMware vRealize Log Insight 4.0

October 18th, 2016

Log Insight is a log aggregation, management and analisys tool, that VMware first introduced in 2013 and now is usually compared with Splunk.
Yesterday VMware announced Log Insight’s new major…

Release: Windows Server 2016 with support for Window Server & Hyper-V containers

October 13th, 2016

Yesterday Microsoft announced the general availability of Windows Server 2016 which the company defines as a cloud-ready OS.
Beside fancy definitions, one of the most relevant perks of this release…

Release: Oracle VM 3.4.2

September 22nd, 2016

During Oracle OpenWorld 2016 the company released version 3.4.2 of its enterprise virtualization solution.
Oracle VM is available for both x86 and SPARC based processor architectures and uses the Xen hypervisor…

VMworld US 2016 Wrap-up

September 1st, 2016

Today was the last day of VMware’s flagship conference VMworld in Las Vegas, an highly controversial edition which left a good chunk of the audience disoriented if not properly disappointed….

Gartner releases its Magic Quadrant for Cloud Infrastructure as a Service for 2016

August 11th, 2016

Last week Gartner updated its Magic Quadrant for Cloud Infrastructure as a Service (IaaS) for the year 2016. The Magic Quadrant for the year 2015 was released in May last year…

Release: Ansible Tower 3 by Red Hat

August 2nd, 2016

Ansible is one of the four main players in the automation market, younger then the well known Chef and Puppet, has been launched in 2013 in Durham, N.C. and acquired…

IBM announces earnings for Q2 2016

July 19th, 2016

Yesterday IBM announced its results for Q2 2016.

If we compare with the same quarter in 2015 earnings per share, from continuing operations, decreased 22%. Net income, from continuing operations,…

 
Monthly Archive