linux-kernel - Re: [PATCH net-next 0/3] net: Switch tag HW extraction/insertion

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Date:	Fri, 31 Jul 2015 15:24:09 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	florian@...hacore.org
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	vivien.didelot@...oirfairelinux.com,
	jerome.oufella@...oirfairelinux.com, linux@...ck-us.net,
	andrew@...n.ch, cphealy@...il.com, mathieu@...eaurora.org,
	jonasj76@...il.com, andrey.volkov@...vision.fr,
	Chris.Packham@...iedtelesis.co.nz
Subject: Re: [PATCH net-next 0/3] net: Switch tag HW extraction/insertion

From: Florian Fainelli <florian@...hacore.org>
Date: Thu, 30 Jul 2015 18:51:57 -0700

> On 30/07/15 15:51, David Miller wrote:
>> From: David Miller <davem@...emloft.net>
>> Date: Thu, 30 Jul 2015 14:19:35 -0700 (PDT)
>> 
>>> This looks fine, series applied, thanks.
>> 
>> I think your control block is too large, you'll need to rework this
>> somehow.
> 
> So napi_gro_cb really is 48 bytes on 64-bits architectures (had not
> realized it was so big).
> 
> What would you recommend to do here considering that this driver is
> currently used on 32-bits platforms, but I see no reason why someone
> would no want to use this feature on a 64-bit platform, yet we are
> competing with napi_gro_cb, and adding a new skbuff member is pretty
> much a no-no? Would it be acceptable to have a new member which is ifdef
> CONFIG_NET_DSA_TAG_BRCM?
> 
> FWIW, this does provide a small 2-3% throughput increase for RX.

You really need to find a way to make it fit in it's current size
on 64-bit.
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