Re: Byte throughput of an interface?

["Casey Callendrello" <user=1546@nabble.blu.org>]

 I've always liked iperf.  It has lots of configurable options, like   
TCP window size, packet length, and whether or not to do a bi- 
directional test.  Plus, it's free in every sense of the word. 

http://dast.nlanr.net/Projects/Iperf/

--Casey 


On Nov 7, 2007, at 10:11 PM, Matthew Gillen wrote: 

> John Chambers wrote: 
>> 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 like iptraf (choose "General interface stats") from 
> http://iptraf.seul.org/ as a text-mode network monitor.  I think   
> the issue 
> is that the number isn't directly in /proc, but rather there are   
> some things 
> in /proc that you could use to calculate it (ie the Tx/Rx 'bytes'   
> fields of 
> /proc/net/dev).  Have fun with the parsing ;-) 
> 
> You could also run 'ifconfig' and parse the output of that   
> periodically (the 
> last line for each interface has tx/rx bytes) 
> 
>> I've considered using tcpdump, but that seems like a huge cpu load to 
>> get data that's probably just lying about somewhere ... 
> 
> Yea, that's way overkill. 
> 
> Matt 
> 
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