Nested ESXi 6.7 poor network performances on 10G network

Hello,

i'm trying to setup a nested lab on 2 physical host with ESXi 6.7 U1 installed. I've configured DVS and a dpg dedicated to Nested ESXi hosts.

To enable MAC learning for the specific dpg i've followed (thanks William):

https://www.virtuallyghetto.com/2018/04/native-mac-learning-in-vsphere-6-7-removes-the-need-for-promiscuous-mode-for-nes…

Checking if it's enabled:

PS C:\Users\Administrator.LAB> Get-MacLearn -DVPortgroupName @("vds01 - vESXi-Trunk")

 

 

 

 

DVPortgroup            : vds01 - vESXi-Trunk

MacLearning            : True

NewAllowPromiscuous    : False

NewForgedTransmits     : True

NewMacChanges          : False

Limit                  : 4096

LimitPolicy            : DROP

LegacyAllowPromiscuous : True

LegacyForgedTransmits  : True

LegacyMacChanges       : False

Seems good.

But if i try to test network performances (first on the same physical host) i see quite poor results:

iperf client:

[root@m-esxi01:/usr/lib/vmware/vsan/bin] ./iperf3  -i -t300 -c 172.28.101.2 -fm

Connecting to host 172.28.101.2, port 5201

[  4] local 172.28.101.1 port 59316 connected to 172.28.101.2 port 5201

iperf3: getsockopt - Function not implemented

[ ID] Interval           Transfer     Bandwidth       Retr  Cwnd

[  4]   0.00-10.00  sec  2.02 GBytes  1738 Mbits/sec    0   0.00 Bytes      

- - - - - - - - - - - - - - - - - - - - - - - - -

[ ID] Interval           Transfer     Bandwidth       Retr

[  4]   0.00-10.00  sec  2.02 GBytes  1738 Mbits/sec    0             sender

[  4]   0.00-10.00  sec  2.02 GBytes  1738 Mbits/sec                  receiver

 

 

iperf Done.

[root@m-esxi01:/usr/lib/vmware/vsan/bin]

iperf server:

[root@m-esxi02:/usr/lib/vmware/vsan/bin] ./iperf3.copy -s

-----------------------------------------------------------

Server listening on 5201

-----------------------------------------------------------

Accepted connection from 172.28.101.1, port 44099

[  5] local 172.28.101.2 port 5201 connected to 172.28.101.1 port 59316

iperf3: getsockopt - Function not implemented

[ ID] Interval           Transfer     Bandwidth

[  5]   0.00-1.00   sec   232 MBytes  1.94 Gbits/sec                 

iperf3: getsockopt - Function not implemented

[  5]   1.00-2.00   sec   183 MBytes  1.54 Gbits/sec                 

iperf3: getsockopt - Function not implemented

[  5]   2.00-3.00   sec   208 MBytes  1.75 Gbits/sec                 

iperf3: getsockopt - Function not implemented

[  5]   3.00-4.00   sec   212 MBytes  1.78 Gbits/sec                 

iperf3: getsockopt - Function not implemented

[  5]   4.00-5.00   sec   198 MBytes  1.66 Gbits/sec                 

iperf3: getsockopt - Function not implemented

[  5]   5.00-6.00   sec   203 MBytes  1.71 Gbits/sec                 

iperf3: getsockopt - Function not implemented

[  5]   6.00-7.00   sec   199 MBytes  1.67 Gbits/sec                 

iperf3: getsockopt - Function not implemented

[  5]   7.00-8.00   sec   200 MBytes  1.67 Gbits/sec                 

iperf3: getsockopt - Function not implemented

[  5]   8.00-9.00   sec   217 MBytes  1.82 Gbits/sec                 

iperf3: getsockopt - Function not implemented

[  5]   9.00-10.00  sec   197 MBytes  1.65 Gbits/sec                 

iperf3: getsockopt - Function not implemented

[  5]  10.00-10.10  sec  23.0 MBytes  1.92 Gbits/sec                 

- - - - - - - - - - - - - - - - - - - - - - - - -

[ ID] Interval           Transfer     Bandwidth

[  5]   0.00-10.10  sec  0.00 Bytes  0.00 bits/sec                  sender

[  5]   0.00-10.10  sec  2.02 GBytes  1.72 Gbits/sec                  receiver

-----------------------------------------------------------

Is that a "normal" results for nested environments? If not, what can i check to improve performances?

Thanks, kind regards,

Nicola