connectx-5 max speed 68Gb?

Infrastructure & Networking Adapters And Cables Ethernet Adapter Cards
#1

Hi,

I’m just starting to use the connectx-5 with iperf3 to replicate one lab that i created with the connectx-4 but no luck at the moment.

I used the same 2 x server hardware (Supermicro X9DRi-LN4F+ - E5-2600 2U with 2 x 2.60 GHz Eight (octa) Core Xeon E5-2650 V2 and 48Gb of RAM)

and while with connectx-4 i can reach 98Gbps (RX and TX) with connectx-5 i can reach only around 68Gbps.

If i connect one of the servers with connectx-5 with one of the connectx-4 server and do traffic connectx-5 ===> connectx-4 TX is 98Gbps but when i do it

in reverse connectx-4 ===> connectx-5, RX of the connectx-5 is 68Gbps.

I have exactly the same Os (centos 7.4) with the same config (i even try to update the OFED drivers to the latest).

Do anyone experienced the same?

Regards,

#2

H,

We don’t expect this behavior.

Please look for errors in ethtool statistics.

CRC or PCI errors

All phy counters

Out of buffer counters

Thanks,

Amir.

#3

Hi Amir,

Thanks for your tips, i will check it (and post here is i don’t see anything wrong) when i’m back from holidays.

Regards,