netdev - possible macvlan packet loss

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Message-ID: <CABkKHSZV7OmkNnkZRi7dF=-_bJK9i4p_8XLdV_Zd0=Z_O8Jf6A@mail.gmail.com>
Date:   Tue, 24 Jan 2023 16:14:03 +0100
From:   Aleksander Dutkowski <adutkowski@...il.com>
To:     netdev@...r.kernel.org
Subject: possible macvlan packet loss

Hello,

we are experiencing something, that seems to be packet loss on macvlan
interface.
Input is ~350Mbps of multicasts, scattered over 120 docker containers,
each having macvlan on top of the same mellanox 10G NIC. Each of
macvlans have bcqueuelen set to INT_MAX.
Streams recorded from phys interface have all packets, whereas streams
recorded from macvlan have drops.

I wonder what is the best way to test and measure the queue fulfillment?
We can do simple printf when the queue is full, but maybe there are
some tools or techniques I'm not aware of that we can use?

Thanks
Alex