netdev - RE: [PATCH net-next] net: macb: replace literal constant with NET_IP

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Date:	Fri, 3 Jul 2015 16:18:40 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Eric Dumazet' <eric.dumazet@...il.com>,
	Joe Perches <joe@...ches.com>
CC:	Nicolae Rosia <nicolae.rosia@...tsign.ro>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	'Nicolas Ferre <nicolas.ferre@...el.com>
Subject: RE: [PATCH net-next] net: macb: replace literal constant with
 NET_IP_ALIGN

From: Eric Dumazet
> Sent: 01 July 2015 23:14
> To: Joe Perches
...
> > > Then please use netdev_alloc_skb_ip_align(), so that you get rid of
> > > skb_reserve()
> >
> > It seems there are ~50 of these in the kernel tree
> > that could be converted.
> >
> 
> Make sure the 2 is really NET_IP_ALIGN
> 
> Some hardwares need 2, even if NET_IP_ALIGN is 0 (on x86 arches for
> example)

Even on x86 aligning the ethernet receive data on a 4n+2
boundary is likely to give marginally better performance
than aligning on a 4n boundary.

	David