Re: A further question on using the -l option
Jim:
Jim Mozley wrote:
> A further question on using the -l option.
>
> If I use the command below (on a 100 Mb/s link):
>
> iperf -u -c 172.18.1.1 -b 90m -t 300 -l 100B
you also used "-i 1"... ;)
>
> After a time I see the following from the server output:
>
> [ 6] 154.0-155.0 sec 7.01 MBytes 58.8 Mbits/sec 0.013 ms
> 46088/119609 (39%)
> [ 6] 155.0-156.0 sec 7.00 MBytes 58.7 Mbits/sec 0.018 ms
> 43404/116817 (37%)
> [ 6] 156.0-157.0 sec 6.31 MBytes 52.9 Mbits/sec 0.016 ms 0/66157
> (0%)
> [ 6] 157.0-158.0 sec 6.33 MBytes 53.1 Mbits/sec 0.017 ms 0/66423
> (0%)
>
> The number of datagrams/s seems to lower and packets stop being dropped
> or at least only a few get lost. The time to reach this point seems to
> vary but it appears to be consistent behaviour if I repeat the test. Is
> there any reason why the Iperf client would start to send fewer packets,
> as this is what appears to happen, or am I mistaken about what is
> happening?
The standard test should be 60 seconds according to RFC 2544,
but this behaviour means that something is "stabilizing" or that
Iperf is not reporting correct numbers..
contrast with 1 second query to your SNMP switch (loss counters)..
regards,
>
> Thanks,
>
> Jim Mozley
>
>
--
Marcelo Maraboli Rosselott
Jefe Area de Redes (Network & UNIX Systems Administrator)
Ingeniero Civil Electronico (Electronic Engineer)
Direccion Central de Servicios Computacionales (DCSC)
Universidad Tecnica Federico Santa Maria, Chile.
phone: +56 32 654237
mailto:marcelo.maraboli --at-- dcsc.utfsm.cl http://elqui.dcsc.utfsm.cl/