[CentOS] Check my math please

Nifty Cluster Mitch niftycluster at niftyegg.com
Fri Nov 7 00:16:15 UTC 2008


On Wed, Nov 05, 2008 at 03:59:34PM -0600, Sean Carolan wrote:
> 
> > Don't forget that the data speed != line speed.
> > A line will only carry about 70% of the line
> > speed as data because of packet overheads.
> 
> Thanks for pointing this out.  I believe I have enough information to
> make my case.  My guesstimate before seeing the actual file sizes was
> that this would never work with less than a 2Mb/s connection, turns
> out I was pretty close!

Also compute the error recovery and lost packet detection and recovery
issues in terms of buffering.   In general you want a pad and flow
control strategy.   Some streams do well and others not.....

If you use a reliable stream you will depend on the protocol for error recovery.
Reliable data streams may not match your data's data structures and may require
larger buffers than an initial back of envelope computation will indicate.

see http://en.wikipedia.org/wiki/Sorcerer%27s_Apprentice_Syndrome



-- 
	T o m  M i t c h e l l 
	Found me a new hat, now what?



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