linux-kernel - Re: [PATCH] net: mv643xx

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Date:	Thu, 11 Apr 2013 13:31:19 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	sebastian.hesselbarth@...il.com
Cc:	w@....eu, andrew@...n.ch, jason@...edaemon.net,
	benh@...nel.crashing.org, linux-kernel@...r.kernel.org,
	florian@...nwrt.org, smoch@....de, paulus@...ba.org,
	buytenh@...tstofly.org, dale@...nsworth.org,
	netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] net: mv643xx_eth: Add GRO support

From: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Date: Thu, 11 Apr 2013 17:27:03 +0200

> On Thu, Apr 11, 2013 at 5:03 PM, Willy Tarreau <w@....eu> wrote:
>> On Thu, Apr 11, 2013 at 04:47:49PM +0200, Sebastian Hesselbarth wrote:
>>> I tried todays net-next on top of 3.9-rc6 without any gro patch, with
>>> the initial
>>> patch (Soeren) and your proposed patch (Willy). The results show that
>>> both patches
>>> allow a significant increase in throughput compared to
>>> netif_receive_skb (!gro, !lro)
>>> alone. Having gro with lro disabled gives some 2% more throughput
>>> compared to lro only.
>>
>> Indeed this is consistent with my memories, since Eric improved the
>> GRO path, it became faster than LRO on this chip.
> 
> I don't have a strong opinion on whether Soeren's or your proposal should
> be submitted. But I insist on having one of them in, as GRO significantly
> improves the common use case, is enabled by default, and not as
> constrained as LRO.

I think, as per other drivers, LRO should be eliminated completely from
all drivers, including this one, and GRO used exclusively instead.
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