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Technology for Using High Performance Networks or How to Make Your Network Go Faster…. Robin Tasker ([email protected]) UK Light Town Meeting 9 September 2004. Throughput? What’s the problem?. One Terabyte of data transferred in less than an hour. - PowerPoint PPT Presentation
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Technology for Using High Performance Networks
or
How to Make Your Network Go Faster….
Robin Tasker ([email protected])
UK Light Town Meeting9 September 2004
Presenter Name
Facility Name
One Terabyte of data transferred in less than an hour
On February 27-28 2003, the transatlantic DataTAG network was extended, i.e. CERN - Chicago - Sunnyvale (>10000 km).
For the first time, a terabyte of data was transferred across the Atlantic in less than one hour using a single TCP (Reno) stream.
The transfer was accomplished from Sunnyvale to Geneva at a rate of 2.38 Gbits/s
Throughput? What’s the problem?
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Facility Name
Just the Internet2 Land Speed Record…
OK
We can get transatlantic rates of 6.5 Gbits/s, but how was that done?
What’s the magic?
So you thought 2.38 Gbits/s was good?
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Facility Name
InternetInternet
Regional Regional
RegionalRegional
Campus
Campus
Campus
Campus
Client
Server
Just a Well Engineered End-to-End Connection
End-to-End “no loss” environment from CERN to Sunnyvale!
At least a 2.5 Gbits/s capacity pipe on the end-to-end path
Processor speed and system bus characteristics
TCP Configuration – window size and frame size (MTU)
Network Interface Card and associated driver and their configuration
A single TCP connection on the end-to-end path
Memory-to-Memory transfer; no disk system involved
No real user application
That’s to say the devil is in the detail…
Sorry. No magic here…..
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Facility Name
Campus
Campus
Campus
Campus
Client
Server
UK LightUK Light
Just a Well Engineered End-to-End Connection
End-to-End “no loss” environment
At least a 2.5 Gbits/s capacity pipe on the end-to-end path
Processor speed and system bus characteristics
TCP Configuration – window size and frame size (MTU)
Network Interface Card and associated driver and their configuration
A single TCP connection on the end-to-end path
Memory-to-Memory transfer; no disk system involved
No real user application
Even with UK Light, the devil is in the detail …and it’s harder!
And how about the same across UK Light?
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Facility Name
The Easy Bits…. :-)
End-to-End “no loss” environment
At least a 2.5 Gbits/s capacity pipe on the end-to-end path
Processor speed and system bus characteristics
TCP Configuration – window size and frame size (MTU)
Network Interface Card and associated driver and their configuration
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Facility Name
Read the Details Here
http://grid.ucl.ac.uk/nfnn.html
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Now for the hard bits…
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A Single TCP Connection
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Fortunately there’s good news!
Standard TCPRecovery >10 minutes
Scalable TCPVery rapid recovery
High Speed TCPRapid recovery
Comparison of TCP stack performance under loss rate of 1 in 10**6, RTT=108ms
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Facility Name
Memory to memory; no disk system
High Speed TCP transfer using Iperf,i.e. no disk system and no application
Web100 records of High Speed TCPduring a http-Get data transfer, i.e.disk system but no application
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Understanding disk systems
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Facility Name
No real user application
High Speed TCP transfer using Iperf,i.e. no disk system and no application
Web100 records of High Speed TCPduring a http-Get data transfer, i.e.disk system but no application
Web100 records of High Speed TCPduring a GridFTP data transfer, i.e.disk system and real userapplication
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Understand your Application
It’s YOUR application, so remember
Three Golden Rules
Benchmark!
Benchmark!!
Benchmark!!!
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Facility Name
Book Early!!!
- Pro
visi
onal
ly -
Tues
day
1st –
Wed
nes
day
2nd M
arch
2005
NeS
C
http://grid.ucl.ac.uk/nfnn.html
