[mrtg] Re: Maxbytes for 1 meg serial?

Nick Bastin nbastin at rbbsystems.com
Fri Dec 10 21:33:27 MET 1999

on 12/10/99 4:56 AM, Alex van den Bogaerdt at alex at slot.hollandcasino.nl

> Why do you think 1m=1024k==131072?  What distance is a kilometer,
> how many grams go in a kilogram?

Yes, I know this, but I work in embedded programming, where it's very well
worth knowing that indeed a one megabit chip is 128k, not 125k.
> An exception is made for computer memory and disk space because of the
> fact that ten address lines with two possible states is possible while
> three lines with ten states is next to impossible.
> To make things more complicated:  for diskspace it is common to use
> 1024 per kilo and 1000kilo per mega.  For memory it is 1024*1024 per mega.
> In other words: 1024 per kilo is strange; if it is not common to use it,
> use the normal value:1000.  1024 is the exception and this is not used
> for line speed.

Ok, I think we've pretty much settled that line speed does not use the
computer worlds' whacked out version of K.  It just makes math fun.. ;-)
(On a 10mbit link, you should be able to move 10 megabytes in 8 seconds, if
the terminology meant the same things, but you can't....it actually takes
you almost 9 seconds.  Of course this is all theory anyhow, since it really
takes you 15 seconds.. :-))

Nick Bastin <nbastin at acm.org>

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