Bandwidth Limits

Martin Pool mbp at
Thu Nov 22 14:55:45 EST 2001

On 20 Nov 2001, tim.conway at wrote:
> It is a bit less than obvious... It can be sure about its own kBps, but 
> wire protocols may vary... 100Mbps of ethernet is not 100/16 ofr 16Mbps 
> token ring is not 100/1.044 of T1 is not ...whatever....  rsh,, ssh, and 
> rsync transport protocols vary in overhead... the one thing of which rsync 
> can be certain is the number of bytes of actual data it transfers... At 
> least, that's my take on it.

Right... sockets work in bytes, not bits, and as Tim says there is
always overhead.  Dividing wire speed in bits/s by ten often gives a
reasonable estimate for bytes/s, since most transports have some
framing or interpacket or redundancy overhead.


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