contention

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Contention-Aware Analysis of Routing Schemes for Mobile Opportunistic Networks

A large body of work has theoretically analyzed the performance of routing schemes for mobile opportunistic networks. But a vast majority of these prior studies have ignored wireless contention. This paper analyzes the performance of routing schemes under contention. To model contention the paper uses the recently-proposed analytical framework which...

Tags: Contention, Aware, Mobile, Network, Scheme, Analysis, Advertising & Promotion, Wi-Fi, Wireless, Networking, Marketing

White papers 2007-06-11

Memory and Network Bandwidth Aware Scheduling of Multiprogrammed Workloads on Clusters of SMPs

Symmetric Multiprocessors SMPs, combined with modern interconnection technologies are commonly used to build cost-effective compute clusters. However, contention among processors for access to shared resources, as is the main memory bus and the NIC can limit their efficiency significantly. This paper first provides an experimental demonstration of the effect of...

Tags: Algorithm, Contention, Aware, Bandwidth, Network, Memory, IEEE, Engineering, Networking, Processors, Semiconductors, Hardware, Components

White papers 2006-07-26

Memory Bandwidth Aware Scheduling for SMP Cluster Nodes

Clusters of SMPs are becoming increasingly common. However, the shared memory design of SMPs and the consequential contention between system processors for access to main memory can limit their efficiency significantly. This paper first provide experimental evidence that contention on the shared memory bus can have major impact on the...

Tags: Contention, Aware, Memory, Memory Bandwidth, IEEE, Flash Memory, Processors, Semiconductors, Hardware, Components

White papers 2006-07-26

Comparison of Modified Dual Queue and EDCA for VoIP Over IEEE 802.11 WLAN

The popular IEEE 802.11 WLAN today does not provide any Quality-of-Service QoS because of its contention-based channel access nature of the Medium Access Control MAC. Therefore, this paper proposes a simple software upgrade-based solution, called a dual queue scheme, to provide QoS to real-time services such as Voice-over-IP VoIP in...

Tags: Contention, IEEE 802.11, Seoul National University, QoS, MAC, Telephony, Wireless LANs, VOIP, Telecommunications, Networking, Wireless

White papers 2006-03-20

Bandwidth Contention With Backpressure Scheme Over VDSL Network

Bandwidth Contention in VDSL network occurs whenever the demand of bandwidth consumption exceeds the network capacity per se, causing lower throughputs and higher traversal time delays. If the bandwidth contention cannot be ease nor appropriately controlled, some sessions transported by the network may not meet their Quality-of-Services QoS. An existing...

Tags: Contention, QoS, VDSL, Network, DSL, Networking, Telecommunications, Personal Technology

White papers 2006-02-01

Are virtual assets taxable?

Are virtual assets taxable?Taxing virtual winningsIt is real earning that are taxed. Until you sell your cache of weapons, you haven't a taxable event. An idea is about as virtual as you can get, yet it's only when you make real profit that the tax code kicks in.Joy!I think it's...

Tags: Taxes, Free trade, Games, asset, contention, tax, game, government

Discussion threads 2006-01-17

Performance Analysis of Contention Based Medium Access Control Protocols

This paper studies the performance of contention based Medium Access Control MAC protocols. This paper provides a simple and accurate method for estimating the throughput of IEEE 802.11 DCF and IEEE 802.11e EDCA. The method is based on a rigorous analysis of the Markov chain associated with the back-off process...

Tags: Method, Contention, IEEE 802.11, MAC, Performance, Protocol, Wireless LANs, Wi-Fi, Wireless

White papers 2006-01-02

Z-MAC: A Hybrid MAC for Wireless Sensor Networks

This paper presents the design, implementation and performance evaluation of a hybrid MAC protocol, called Z-MAC, for wireless sensor networks that combines the strengths of TDMA and CSMA while offsetting their weaknesses. Like CSMA, Z-MAC achieves high channel utilization and low-latency under low contention and like TDMA, achieves high channel...

Tags: Contention, MAC, Performance, Network, TDMA, Sensor, Association For Computing Machinery, Z-MAC, Performance Management, Cellular Phones, Wi-Fi, Wireless, Human Resources, Workforce Management, Consumer Electronics, Personal Technology

White papers 2005-11-04

On Lower Bounds for MAC Layer Contention in CSMA/CA-Based Wireless Networks

Wireless LANs operating within unlicensed frequency bands require random access schemes such as CSMA/CA, so that wireless networks from different administrative domains for example wireless community networks may co-exist without central coordination, even when they happen to operate on the same radio channel. Yet, it is evident that this lack...

Tags: Contention, MAC, Network, Wireless Network, Wi-Fi, Wireless

White papers 2005-09-02

Understanding 802.11e Contention-Based Prioritization Mechanisms and Their Coexistence With Legacy 802.11 Stations

The IEEE 802.11e task group has reached a stable consensus on two basic contention-based priority mechanisms to promote for standardization: usage of different arbitration interframe spaces and usage of different minimum/maximum contention windows. The goal of this paper is to provide a thorough understanding of the principles behind their operation....

Tags: Contention, IEEE 802.11, Performance, IEEE, Performance Management, Human Resources, Workforce Management

White papers 2005-07-01

TechNet Webcast: SQL Server 2005 Series (Part 3 of 10): Achieving Greater Concurrency (Level 200)

SQL Server 2005 provides enhancements to enable greater concurrency and significantly reduce lock contention. The presenter of this webcast shows how to use Snapshot Isolation to reduce currency contention. The attendee will gain an understanding of database snapshots and replication for scaling and read-only views, and learn how Dynamic Management...

Tags: Contention, Webcast, Microsoft SQL Server, Microsoft SQL Server 2005, Microsoft TechNet, Databases, Digital Media, Storage, Enterprise Software, Software, Data Management, Consumer Electronics, Personal Technology, Hardware

Webcasts

Additional Resources

Data Processing scores big success! Linux loses, again!

Data Processing scores big success! Linux loses, again!Wrong title, MurphIt should be "IT N00bs at large in Canada" or something along those lines :)Also funny they switched to a windows server. "Oh, we understand windows, cause we use it at home! let's try that! Oh no use! Oh no, what...

Tags: Operating systems, data-processing, Murph, Linux, big success, Microsoft Windows, Microsoft Corp.

Discussion threads 2008-10-06

Microsoft JQuery adoption is an open source tipping point

Microsoft JQuery adoption is an open source tipping pointOptimistAnother way to express your contention is that Microsoft has decided open source is so insignificant a threat that it can be used when convenient without any danger of lost revenues and profits. As a business model open source has peaked...

Tags: Microsoft JQuery adoption, open source, Microsoft Corp.

Discussion threads 2008-09-29

'John McCain invented the Blackberry'

A fabulous little story posted to Comcast explains how one misguided adviser (exactly who is he advising?) for Republican presidential nominee John McCain claims that the dear senator helped create RIM's popular tap-tapping device, you know, in like, a really indirect way: At...

Tags: John McCain, RIM BlackBerry, Handhelds, Investment, Hardware, Finance, Andrew Nusca

Blog posts 2008-09-16

What's the big deal about the Firefox EULA?

What's the big deal about the Firefox EULA?LIfe must be better than the news tells us...If this is what people are complaining about. Then someone's not paying attention.Well, if EVERY single program flashed up an EULA the first time you used itTHAT would get pretty old, especially for a...

Tags: Mozilla Firefox, EULA

Discussion threads 2008-09-15

Maybe It's Time for Twenty-Somethings To Take Over Media

Media companies have to become technology companies, able to quickly and effectively deliver new services that appeal to a generation of readers who only spend about seven minutes a day of their free time reading stuff printed on paper.  That's the contention propounded this morning by Harold...

Tags: Media Company, Technology Company, BusinessWeek, Media, Advertising & Promotion, Marketing, Tom Steinert-Threlkeld

Blog posts 2008-09-08

LIVE: Google Chrome Press Conference

LIVE: Google Chrome Press ConferenceMan, the publicity is nothing short of AMAZING. The mainstream press hasalready picked it up. The news is everywhere, there are already thousands of articles written. Seems like the whole world is buzzing about it.Firefox does NOT use WebKitFirefox uses Mozilla's Gecko rendering engine, which is...

Tags: Web browsers, mainstream press, Google Chrome, Google Inc., Mozilla Firefox

Discussion threads 2008-09-02

Dell bets on Salesforce.com's platform as a service

Dell bets on Salesforce.com's platform as a serviceDeferred revenues?I don't buy the deferred revenue argument. It doesn't make sense. If anything, having larger enterprise deals helps SFdC because it means the running Q's have guaranteed levels of income. Checking the last couple of Q's, there's no real change in deferreds...

Tags: Sales strategy, Sales force management, cloud computing, Operational accounting, Salesforce.com Inc., SFdC, PaaS, revenue, sales, Dell Computer Corp.

Discussion threads 2008-08-21

eBooks volume 3: What is the right price for a device that holds 100s of books?

Over the past couple weeks, I've been conducting polls about ebooks as I think about doing some publishing. The overwhelming response to the polls has been that there is not a sufficiently broad selection of books available in e-formats, regardless of what format, whether for Amazon's Kindle, the Sony Reader...

Tags: E-books, Personal Technology, Mitch Ratcliffe

Blog posts 2008-08-19

Zoho's future in Google's hands?

  Earlier today, Zoho sent over an intriguing email with a whole bunch of numbers and spreadsheet demonstrating why Google in particular is not likely to be a threat to the company. It makes interesting reading. The argument goes something like this: Google's revenue and profit per...

Tags: Software, Revenue, Google Inc., Zoho, Tools & Techniques, Operational Accounting, Management, Finance, Dennis Howlett

Blog posts 2008-08-18