netdev - Re: [PATCH v3 net-next] net: introduce dev_set

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Date:	Sun, 03 Nov 2013 21:00:54 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	Ben Hutchings <bhutchings@...arflare.com>,
	David Miller <davem@...emloft.net>,
	christoph.paasch@...ouvain.be, netdev@...r.kernel.org,
	hkchu@...gle.com, mwdalton@...gle.com
Subject: Re: [PATCH v3 net-next] net: introduce dev_set_forwarding()

On Mon, 2013-11-04 at 12:29 +0800, Herbert Xu wrote:
> On Sun, Nov 03, 2013 at 08:23:02PM -0800, Eric Dumazet wrote:
> > 
> > Well, GRO adds latencies for sure.
> > 
> > You seem to assume the transmit only can happen when NAPI is done, but
> > its not true. As soon as GRO fills one packet (reaches max capacity),
> > packet is delivered and forwarded, even if NAPI handler is not yet
> > complete for the flow.
> 
> Have you actually measured this? The latency added by GRO is pure
> processing overhead.  This is tiny when compared to the time NAPI takes
> to wait.


Please take a look at 

2e71a6f8084e net: gro: selective flush of packets


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