RE: Iperf max b/w
We ran earlier versions of iperf at 2.36Gbits/s from Sunnyvale California to Geneva Switzerland (RTT~170ms). See for example http://www-iepm.slac.stanford.edu/monitoring/bulk/10ge/iperf-snv-chi-jumbo-sylvain-20030227
How fast is your cpu (GHz)
-----Original Message-----
From: Tony Rimovsky [mailto:tony --at-- ncsa.uiuc.edu]
Sent: Friday, October 10, 2003 7:32 AM
To: iperf-users --at-- dast.nlanr.net
Cc: Cameron Harr
Subject: Re: Iperf max b/w
It may be a host limitation. We've seen iperf perform faster than that
(990 Mbps) on high latency gigabit paths with larger windows.
--On Friday, October 10, 2003 8:17 AM -0600 Cameron Harr <charr --at-- lnxi.com>
wrote:
> Hello,
> I seem to have reached some type of maximum bandwidth with iperf
> 1.7.0. At the default TCP window size, I would generally get a b/w in
> the 920's. As I stepped up the window size, I started getting a bit
> higher readings until everything seemed to max out at 941 Mb/s. Now,
> with a window of 256K and larger, I get 941 Mb/s every time -- almost
> like it is getting cut off at that point. I guess it could also be the
> switch (Foundry FI1500), but does anyone know of a possible limit here
> to iperf? Thanks, -Cameron