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QoS for video delivery in shared-I/O

Posted: 12 Mar 2009     Print Version  Bookmark and Share

Keywords:Quality of Service  Compute farms  I/O 

Quality of Service (QoS) has been talked about for over three decades in the networking world. However, as computing and networking industry differences start to blur, and as scale-out architectures are becoming more popular, the QoS that applications receive while running on compute farms has resurged as a hot topic within today's consolidated infrastructures and converged networks. These compute farms require mission-critical and non-mission-critical applications to run on the same physical hardware that would otherwise provide differentiated services.

Compute farms also call for I/O QoS that can differentiate the various types of application/virtual machine flows within the infrastructure. In a shared I/O environment, the I/O devices are being shared across multiple processor complexes that require QoS built into I/O devices and converged fabrics. The converged fabric will need to carry the built-in QoS to I/O devices in the fabric to provide end-to-end application QoS.

QoS means different things to different people, and often is the source of confusion among designers, not the least of who develop video/imaging-systems. Let's look at QoS's role in consolidated/converged systems and the challenges designers face implementing it, and then examine straightforward methods for successful QoS deployment.

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