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Byte throughput of an interface?



 Something that turned out to be surprisingly difficult to  find:  How 
does  one  learn  the  actual data rate (in Bytes) of a linux network 
interface? 

There are lots of tools that give the packet rate, starting with good 
old "netstat -i".  It's interesting and useful info.   But  what  I'm 
trying  to  find  is  the total byte (or byte/sec) throughput of some 
interfaces.  I know it's gotta be there somewhere, probably in one of 
those  directories  under  /proc, but I don't seem to be guessing the 
right keywords to find it. 

Anyone know off the top of their head? 

I've considered using tcpdump, but that seems like a huge cpu load to 
get data that's probably just lying about somewhere ... 


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