netdev - Re: [0/14] GRO: Lots of microoptimisations

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Date:	Fri, 29 May 2009 19:28:21 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Benjamin LaHaise <ben.lahaise@...erion.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [0/14] GRO: Lots of microoptimisations

On Thu, May 28, 2009 at 11:21:43AM -0400, Benjamin LaHaise wrote:
> 
> With GRO off I'm getting ~4.7-5Gbps to the receiver which is CPU bound with 
> netperf.  With GRO on, that drops to ~3.9-4.3Gbps.  The only real difference 
> is the entry point into the net code being napi_gro_receive() vs 
> netif_receive_skb().

That doesn't sound right at all.  Can you run tcpdump on it to see
if it's actually aggregating?

Thanks,
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