Re: No UDP over 2Gb/s

[Marc Herbert <marc.herbert --at-- ens-lyon.fr>]

On Wed, 28 Jul 2004, Steven Carter wrote:

> I am unable to get iperf to send a UDP stream at more that 2Gb/s:


In iperf-1.7.0/src/Settings.hpp, you can see:

/*
 * The ext_Settings is a structure that holds all
 * options for a given execution of either a client
 * or server...
 */
struct ext_Settings {
    char*  mFileName;               // -F
    char*  mHost;                   // -c
     .
     .
     .
    int mUDPRate;                   // -b or -u
   ^^^^^

An "int" ranges only from -2^31 to 2^31 on 32bits architectures, that
is from -2G to +2G.

Use a 64bits machine ;-)

More seriously, you can try to switch that variable to a "long" (or to
an "unsigned int"), but I would be surprised if changing only the line
above is enough to make it work. But it's so easy that it worths a
try.