netdev - Re: VLAN HW accel, performance advantage?

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Message-ID: <OF0F246C2A.B5DC5CA4-ONC1257BDB.004CA4E6-C1257BDB.004DB31E@transmode.se>
Date:	Tue, 3 Sep 2013 16:08:40 +0200
From:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	netdev@...r.kernel.org
Subject: Re: VLAN HW accel, performance advantage?

Ben Hutchings <bhutchings@...arflare.com> wrote on 2013/09/03 15:50:16:
> 
> 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.

Thanks Ben

I figured one would avoid some memmoves if the tag was extracted and as we 
got
a fairly slow CPU (some 300 MHZ MPC 8321) one should gain some performance 
but not so then.

I am not familiar with GRO( and its friends) but I am guessing it won't 
help
the bridge function or reduce stress from packet storms?

 Jocke

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