This might be useful:
https://fasterdata.es.net/network-tuning/udp-tuning/
On Sat, Feb 3, 2018 at 09:48 Fran Terlingo (fterling) <fterl...@cisco.com>
wrote:
> IPerf Experts,
>
>
>
> I am performing tests between an iPerf 3.1.3 client running on a Linux
> Ubuntu Virtual machine on a VMware ESX host and a similar setup with the
> iPerf 3.1.3 server VM running on a separate ESX server. The ESX servers
> have 10 Gig NICs with plenty of CPU and both connect to a network with a 40
> Gig core. I am able to drive 10 Gbps linerate bandwidth when running iPerf
> “TCP” flows between the client and server. However, the most I can get when
> running a “UDP” test is roughly 5.5 Gbps transmission rate. I actually
> tweaked a couple of iPerf parameters to increase the transmission rate that
> ultimately got me to 5.5 Gbps -- but that is all I can get so far. It
> doesn’t look like the VMs running iPerf are CPU bound so it must be the
> iPerf UDP settings are not optimized.
>
>
>
> Can someone provide guidance on the optimal iPerf settings to get the
> maximum transmission rate when using a UDP flow ??
>
>
>
> Side question: When running iPerf 3.1.3, I was not able use the "-u" flag
> on the server as it stated this was an invalid argument. I also tried
> changing the listening port as well with no luck. I was able to have the
> client set the UDP test and the server was able to accept the UDP test from
> the client. I just can’t set the options on the server side of iPerf 3.1.3
> the way I can with the 2.x releases. I'm not sure if this is something on
> my end or if this is expected behavior. I also need to change the port the
> server listens on and can't get that working when using the “-p” flag on
> the server nor when I try to set the server side port on the client.
>
>
>
> Sorry, just a few more questions. I see there is a way to set the TOS with
> the "-S" flag. Is there a way to set the DSCP (Diffserv) marking in the
> packet instead of TOS ?? Lastly, is there a way to set the MTU size of the
> frame generated by iPerf or possibly even use jumbo frames ??
>
>
>
> Thanks,
>
> Fran
>
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