Take the 2-minute tour ×  I am using iperf to test my bandwidth.
But I am not getting whether it is showing my upload or download
speed. Say, I have two PCs A and B. If I want to test how fast I
can download a file to A from B, where should I run the server
i.e "iperf -s" ? on A or B ? Thanks in advance.  share|improve
this question  2 Answers 2  Traffic way is from client to
server.  From manpage:  To perform an iperf test the user must
establish both a server (to discard traffic) and a client (to
generate traffic)  share|improve this answer There's a great gui
to Iperf that can be found at code.google.com/p/xjperf – 
Florent Courtay Feb 10 '11 at 15:11  It's from to.  So if you
run the listen daemon on B, and connect via A thats testing the
TX performance from A to B, simply do it the other way around to
test the connection back.  share|improve this answer  Your
Answer