netdev - Re: VLAN HW accel, performance advantage?

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Message-ID: <1378216216.1545.1.camel@bwh-desktop.uk.level5networks.com>
Date:	Tue, 3 Sep 2013 14:50:16 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
CC:	<netdev@...r.kernel.org>
Subject: Re: VLAN HW accel, performance advantage?

On Tue, 2013-09-03 at 11:05 +0200, Joakim Tjernlund wrote:
> I am considering impl. VLAN HW acceleration in Freescales ucc_geth driver 
> to improve
> performance, primarily for bridged interfaces.
>  I am hoping the community has some insights as to what performance gains 
> one
> could expect?

At the moment you need to do VLAN RX offload (or fake it in software) to
take advantage of GRO for VLAN-encapsulated packets.  Other than that, I
don't think it makes a lot of difference in most situations.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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