Throughput test with iperf...

takCoder tak.official at
Sun Sep 29 06:38:59 UTC 2013

hi again..

would any of you please at least explain it to me what may cause iperf
server ending up with "Segmentation fault (core dumped)" message right at
the beginning of setting second connection in my bi-directional throughput
test, using -r flag??

i used these commands on client and server on two freebsd machines which
are connected straight with one cat5e cable:

iperf -s -i 1
iperf -c X.Y.Z.T -t 60 -r

just getting more confused.. :(

Best Regards,

On Sat, Sep 28, 2013 at 10:22 AM, takCoder <tak.official at> wrote:

> hi everyone,
> this might be a bit off-topic but i am really confused and in need of your
> helps.. :(
> i need to understand what exactly iperf does while testing network
> throughput?
> i'm trying to run a throughput+frame loss test on a router using iperf,
> and i am really confused with the definitions given for throughput and
> packet-loss and iperf output..
> as i have seen through my searches, throughput is the maximum transfer
> rate at which we have no packet loss, so i thought i have to rerun iperf
> for different transfer rate(in udp test), so i reach maximun rate while
> having no drops...
> but i have seen test videos in which they ran iperf once, with maximum
> bandwidth of the line, and just used the reported throughput and packet
> loss as the required result!
> what's on? does iperf calculate the throughput independent from
> packet-loss? and why is it reporting it named as bandwidth??
> thank you all..
> Kind regards,
> takcoder

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