netdev - Re: VLAN HW accel, performance advantage?

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Message-ID: <1378222150.7360.28.camel@edumazet-glaptop>
Date:	Tue, 03 Sep 2013 08:29:10 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>,
	netdev@...r.kernel.org
Subject: Re: VLAN HW accel, performance advantage?

On Tue, 2013-09-03 at 15:48 +0100, Ben Hutchings wrote:

> GRO should be beneficial for bridges if you have bursty TCP streams.  It
> is especially beneficial if you also have TSO on the TX side.
> 
> Really you're going to have to try it and run benchmarks with your own
> hardware.

Note that ucc_geth does not have GRO support (it calls
netif_receive_skb())

It doesnt have RX checksuming either, so having to validate
tcp checksums (before aggregating them in GRO stack) would hurt if
packets only have to be forwarded.



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