Seems reasonable to me though I'm not an iperf3 expert.
Bob
PS. As a side note, with iperf2
<https://sourceforge.net/projects/iperf2/> which
does support multiple traffic threads, you can get 4 threads using -P 4.
On Tue, Apr 17, 2018 at 6:19 AM, Jeffrey Lane <j...@canonical.com> wrote:
> Hi all,
>
> I have what is kind of a silly question, but who has some experience
> testing 100Gb with iperf3?
>
> I just wanted to validate something with iperf3 to see if it is
> reasonable.
>
> With a single process running, the most I've been able to get out of a
> 100Gb network port is a burst of about 65Gb/s with sustained averages
> of around 50-55Gb/s.
>
> This is after a LOT of kernel tweaks, PCIe tweaks, and network config
> tweaks.
>
> So at this point, I'm thinking that what I'm seeing is a hardware
> bottleneck, since iperf3 isn't multi-threaded.
>
> What I wanted to validate, to get around that is this:
>
> On the target side, I've kicked off four iperf3 processes all bound to
> the same IP but listening on a different port. Now, on the client
> side, I kick off four iperf3 instances, one per remote port. After 30
> minutes of testing, each instance returns an average throughput of
> about 23Gb/s.
>
> So in that scenario is it reasonable that 4 parallel threads reporting
> 23Gb/s can be aggregated to assume we're actually seeing throughput of
> 92Gb/s on the 100Gb port (thus nearly saturated)?
>
> Thanks,
>
> Jeff
>
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