From: Marcelo M. <mar...@us...> - 2004-08-03 15:27:48
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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:mar...@dc... http://elqui.dcsc.utfsm.cl/ |