netdev - Expected performance w/ bonding

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Message-ID: <CAA85sZtrSWcZkFf=0P2iQptre0j2c=OCXRHU8Tiqm_Lpb-ttNQ@mail.gmail.com>
Date:   Wed, 18 Jan 2023 15:21:26 +0100
From:   Ian Kumlien <ian.kumlien@...il.com>
To:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Cc:     andy@...yhouse.net, vfalico@...il.com, j.vosburgh@...il.com
Subject: Expected performance w/ bonding

Hi,

I was doing some tests with some of the bigger AMD machines, both
using PCIE-4 Mellanox connectx-5 nics

They have 2x100gbit links to the same switches (running in VLT - ie as
"one"), but iperf3 seems to hit a limit at 27gbit max...
(with 10 threads in parallel) but generally somewhere at 25gbit - so
my question is if there is a limit at ~25gbit for bonding
using 802.3ad and layer2+3 hashing.

It's a little bit difficult to do proper measurements since most
systems are in production - but i'm kinda running out of clues =)

If anyone has any ideas, it would be very interesting to see if they would help.