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Virtualisation specs to allow shared networking

Posted: 12 Jun 2008     Print Version  Bookmark and Share

Keywords:I/O virtualisation  PCI Express  virtualisation technologies  IOV standards 

The PCI Special Interest Group has released a new set of standards that increases the capabilities of PCI Express for a range of computer and communication systems. The I/O Virtualisation specs open the door to new ways to roll out shared networking capabilities for servers, and communications gear.

"These specifications, in conjunction with [today's] system virtualisation technologies, build on the PCIe protocol stack" in ways "targeted at improving virtualisation performance," said Al Yanes, PCI-SIG chairman and an ASIC designer for IBM's server group.

The standards allow a set of processors on multiple cards or chassis share common I/O chips on another card or chassis, eliminating the need for networking chips on every board or chassis. Thus the approach both lowers costs while ensuring adequate performance for networking in complex server, switch and router systems. The specs also address issues including error handling and quality of service.

For example, using the new specs, engineers can route Express signals from multiple computer cards or chassis over a backplane or cable to a separate, shared networking card in another chassis.

The specs "allow the creation of a new generation of virtualisation solutions to meet increasing customer demands for application consolidation, lower power consumption, and lower hardware provisioning costs," said Renato Recio, co-chairman of the work group that wrote the standards and a senior engineering manager in IBM's server communications group.

PLX Technology said it is working on a new generation of Express switches that support the IOV standards and could be used in a range of server and communications systems. For example, in routers, the chips could link multiple security processors, said Akber Kazmi, marketing director for Express switches at PLX.

"It will enable a totally new market," said David Raun, a vice president of marketing and business development at PLX. In addition the specs will expand opportunities in servers where "virtualisation is pretty hot these days and being implemented in software in pretty much all systems," he added.

Start-up NextIO is upgrading the proprietary Express switches in its systems to comply with the new spec. The company released two I/O chassis in April and expects to field new products based on the IOV standards early next year, including systems that will use third-party DSP line cards aimed at use in edge networks for telecom service providers.

"The requirements for IOV are fairly complex, and due to the need for interoperability and systems management we expect we will continue to develop our own silicon," said Chris Pettey, chief technology officer and founder of NextIO.

The new specs do not replace all the functionality once conceived for a version of Express called Advanced Switching Interconnect that was geared for the needs of embedded systems. The ASI effort was abandoned after it failed to gain traction in the face of other embedded specific interconnects such as RapidIO.

"While IOV can be used to meet some of the usage models that ASI was addressing, at best it is a subset of what was possible with ASI so its adoption and applicability will be limited as a result," said Michael Krause, the other co-chair of the IOV effort and an interconnect specialist at Hewlett-Packard Co.

"For example, ASI defined a series of protocol encapsulation services. IOV only moves Express and then only within a single virtual hierarchy," Krause explained.

On the other hand, Express has gotten broad adoption in computers, lowering the costs of components significantly below rival technologies in the embedded sector such as RapidIO, said Kazmi of PLX.

"We are seeing a lot of adoption of Express in parts of the industry we weren't expecting," Kazmi said, adding that an eight-lane Express switch can cost less than a quarter of the price of a roughly similar RapidIO device.

However, "not everyone will implement all the new IOV features in products, and that could slow the progress some people would like to see," he added.

- Rick Merritt
EE Times

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