SDN Use Case: Multipath TCP at Caltech and CERN

“Everything is getting better with Moore’s Law, but some things are getting better faster than others.”

— Kenneth Church, “The Mobility Gap”


Almost everyone has heard of Moore’s law, which states that CPU processing power goes up by about 100x per decade.  Fewer of us have heard of Kryder’s Law, ie the “Moore’s Law of storage” – it says that we can expect a 1000x increase in disk capacity per decade.  And even fewer have heard of Nielsen’s Law for networking – which only claims a 256x increase of bandwidth capacity in the workplace over the same period.


In short: bandwidth rates aren’t keeping up – in a large part due to limitations of the speed of light. It is this gap in improvement in storage and bandwidth density that Mr Church coined the “mobility gap”. How big is the gap?  Roughly 4X – 18x over each decade. Which doesn’t seem that bad until you also consider the “digital universe” problem which says that AMOUNT of global data is 44x time what is was in 2009 by 2020.

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