[netperf-talk] Netperf & iPerf

[Andrew Gallatin]

Rick Jones writes:
 > 
 > BY default netperf accepts the system's default socket buffer and thus 
 > window size.  Does iperf do that, or have its own default?

I believe that iperf also accepts the defaults.  However, iperf
defaults to an 8KB read/write size, rather than defaulting to reading
and writing the entire socket buffer, like netperf.  This leads to
iperf making many more syscalls than netperf by default.  I think the
8KB default is due to iperf's ttcp roots.  Iperf will also call
gettimeofday around each read/write operation, which can be expensive.


Drew