netdev - Re: possible macvlan packet loss

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Date:   Tue, 24 Jan 2023 23:45:19 +0000
From:   Vadim Fedorenko <vfedorenko@...ek.ru>
To:     Aleksander Dutkowski <adutkowski@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: possible macvlan packet loss

On 24.01.2023 15:14, Aleksander Dutkowski wrote:
> 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.
> 
Is it real packet loss or just reordering of the packets that is accounted by 
the software as a loss?

> 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