DAST: Iperf - rbuteau --at-- miragenetworks.com
>Date: Wed, 23 Mar 2005 16:13:13 -0600
>To: rbuteau --at-- miragenetworks.com
>Subject: DAST: Iperf - rbuteau --at-- miragenetworks.com
>
>Contacting DAST re: Bug report about Iperf
>From: Richard Buteau <rbuteau --at-- miragenetworks.com>
>
>Question/Comment:
>Iperf bandwitdh calculation is inaccurate if test go over 50 seconds.
>
>at 600Mbit/sec for 50 seconds... make about 3.75 Gigabytes of data. the
count is still accurate at 600Mbit/sec.
>
>After 60 seconds it makes about 4.5 Gigabytes of data. the counter reset i
think it went over the 4 gig limit of a 32 bit counter. (may be i quick fix
would be to use 64 bit counter) the average bandwidth goes down to 28
meg/sec...
>
>the case is simple run iperf in tcp mode with one gigabit client and one
gigabit server for 50 seconds then for 60 seconds.
>
>
>Richard
>
>
>
--
Mitch Kutzko | mitch --at-- dast.nlanr.net | mitch --at-- ncsa.uiuc.edu | 217-333-1199
http://hobbes.ncsa.uiuc.edu/