iPerf3 speed between remote and host is slow

[diogoribeiro]

Hi,
So I have a Ubiquiti US-16-150W connected to an Odroid H2+ using two CAT7 cables. I'm using Port 13 and Port 14 on the switch which are "aggregated" as per the following picture:


When i run iperf between two VMs speeds are fine:



But when i do run the iperf between a computer connected by ethernet to my switch speeds drop significantly:



My network configuration is :



And I tried passing the interface both by using Virtio and the e1000 (nevermind the Mac Addresses):

and


With the same results. Considering the Switch is Gigabit and everything is wired i was expecting way higher numbers . Am I doing something wrong?

 

[spirit]

you should use virtio nic, e1000 are too slow.


About lacp, you can't use more than 1 link for 1tcp connection, so you need to use "-P" option to iperf.

also about "bond-xmit-hash-policy" layer2+3 ,
that's the load balancing rules for your tcp connections, layer2+3 = mac-ip address. So if you test between 2 vms, it'll always use same link.
you need to use "layer3+4", to use multiple tcp connections for same ip address. (and -P option in iperf).
This is for the traffic going out your physical nic.

Now , you also need same layer3+4 in your switch lacp config, for traffic going out the switch port, (so coming to destination vm).

 

[diogoribeiro]

Hi,
Thanks for your reply. The reason i went with e1000 is that the VM won't acquire IP if i have virtio nic. Never did, even before LACP. Other machines work fine. XPenology image doesnt work. Any hints on where to start troubleshooting?

Thanks.

 

[dcsapak]

also just to rule it out: did you check the cables? 100mbit are suspicious, it's the speed when you have a partly broken cat5e cable

 

[diogoribeiro]

Cable is fine (just used the tester). Its connected via two cat7 cables.