netdev - Re: [PATCH net-next] net: mvpp2: increase MTU limit when XDP enabled

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Date:   Wed, 6 Jan 2021 15:13:54 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Marek Behún <kabel@...nel.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Sven Auhagen <sven.auhagen@...eatech.de>,
        netdev@...r.kernel.org, davem@...emloft.net,
        Jakub Kicinski <kuba@...nel.org>,
        Matteo Croce <mcroce@...rosoft.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>
Subject: Re: [PATCH net-next] net: mvpp2: increase MTU limit when XDP enabled

On Wed, Jan 06, 2021 at 12:56:08PM +0100, Marek Behún wrote:
> I found out that on Turris MOX I am able to route 2.5gbps (at MTU 1500)
> with XDP. But when not using XDP, when the packets go via kernel's
> stack, MOX is able to route less than 1gbps (cca 800mbps, at MTU
> 1500, and the CPU is at 100%).

Read this:
https://patchwork.ozlabs.org/project/netdev/patch/73223229-6bc0-2647-6952-975961811866@gmail.com/

Disable GRO on the DSA interfaces and you'll be just fine even with IP
forwarding done by the network stack. You don't _need_ XDP for this.