Transfer vs. Bandwidth

To: "'iperf-users --at-- dast.nlanr.net'" <iperf-users --at-- dast.nlanr.net>
Subject: Transfer vs. Bandwidth
From: Jason Hammerschmidt <JHammerschmidt --at-- metroland.com>
Date: Tue, 16 Nov 2004 16:02:54 -0500
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Reply-to: iperf-users --at-- dast.nlanr.net
Sender: owner-iperf-users --at-- dast.nlanr.net

Greetings,

  Couldn't find this answer so I'm posting to the mailing list.  Can anyone
explain how a Transfer of 96.0MBytes over 10.0 seconds equates to
80.4Mbits/sec?  My math 96Mbytes * 8 bits per byte / 10 seconds = 76.8Mbps,
close but not exactly the same as the reported output from iperf (see
below).  I'm running iperf 1.7.0 pthreads on Mac OS X 10.3.3

iperf -c 172.16.155.74
------------------------------------------------------------
Client connecting to 172.16.155.74, TCP port 5001
TCP window size: 65.0 KByte (default)
----------------------------------------------------
[  3] local 10.150.0.89 port 50722 connected with 172.16.155.74 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  96.0 MBytes  80.4 Mbits/sec

Follow-Ups:
- Re: Transfer vs. Bandwidth
  - From: Stephen Hemminger

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