netdev - marvell 6190 NAT performance

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Message-ID: <20190124212640.43813222@nic.cz>
Date:   Thu, 24 Jan 2019 21:26:40 +0100
From:   Marek Behun <marek.behun@....cz>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Andrew Lunn <andrew@...n.ch>, netdev@...r.kernel.org,
        Russell King <rmk+kernel@....linux.org.uk>
Subject: marvell 6190 NAT performance

Hello,

I am encountering strange performance issue when benchmarking NAT
performance on Armada 3720 with Marvell 88e6190 switch.

Download speed (from internet, via Armada 3720 NAT, via switch to LAN
device) is ~750mbps and the CPU running on 100% (mostly in ksoftirq).
Upload speed is ~250mbps.

When the LAN device is connected to A3720 directly (via SFP), the
speeds are both ~1000mbps.

I realize that packing/unpacking packets with Marvell header for the
switch takes some time, but is such a performance drop expected?

This was tested with 5.0.0-rc2 and also 4.14.

Thank you.

Marek