slow network performance

Nov 18, 2020
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Hello
we have a slow network performance.
we have cluster with 6 node, HPE DL360 G10 with 2 port 40Gbit network card.
connect with DAC cable to 2 cisco switch with VPC configured.
and LACP

on PVE 8.2.2 we use open vswitch and LACP.

When we run iperf from 1 node to other one we react 30Gbit but not stable the test float from 17 to 30
and we have a lot or retransmit.

we have try to change the DAC camble, port switch
but nothing changes.
any suggestion?
 

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