Re: Iperf max b/w
Masaki Hirabaru wrote:
> If we use regular MTU 1500B on GbE and running TCP with timestamp
> option (Linux default?), the maximum TCP throughput will be 941
> Mbps. It's the line rate of 1 Gbps.
> I checked iperf source code and found that the number iperf gives us
> is a rate at application layer, i.e. hidden overhead excluded from the
> number will be TCP header and options, IP header and options, and
> ethernet gap, preamble, header, and trailer. In my case, these are 32
> (TCP), 20 (IP) and 38 (ethernet) bytes long.
> With the same calculation, UDP will not go over 957 Mbps with MTU
> 1500B on GbE. If you got those numbers, I think your equipment can be
> considered well tuned under that condition.
Thank you. I haven't tried UDP, but the TCP seems to be maxed out at
Linux Networx Inc