netdev - dsa: mv88e6xxx rstp convergence test

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Date: Wed, 19 Jul 2023 14:58:25 +0200
From: Angelo Dureghello <angelo@...nel-space.org>
To: netdev@...r.kernel.org
Cc: olteanv@...il.com, vivien.didelot@...il.com, andrew@...n.ch
Subject: dsa: mv88e6xxx rstp convergence test

Dear all,

i am testing three switches connected together, the switches are
linux-based using mv88e6xxx dsa driver on kernel 5.4.70. rstp is active 
as a daemon at userspace level.

    SW A  ---- Host
    /    \
SW B --- SW C

A host connected to A sends 1000 arp requests per secs
to SW B, while i disconnect the root path, to test convergence.

Convergence happens sometimes < 50 msec, sometimes near 100.

Do you think i can get a constant convergence time < 50 msec
in some other way ?

Thanks a lot,
angelo