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




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