netdev - Re: Re-queueing of skb in vlan_skb

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Message-ID: <47FF5DAB.1060906@trash.net>
Date:	Fri, 11 Apr 2008 14:46:35 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Brian Oostenbrink <Brian_Oostenbrink@...-sierra.com>
CC:	linux-net@...r.kernel.org,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: Re-queueing of skb in vlan_skb_recv

Brian Oostenbrink wrote:
> In vlan_skb_recv, packets are generally stripped of their vlan header,
> and then re-queued via netif_rx().  Is there a reason for re-queuing
> these instead of calling netif_receive_skb() directly?  On our system
> (an embedded linux router), this re-queuing has a significant
> performance penalty.

Its done to save stack space. There's currently a discussion
about making loopback use netif_receive_skb in case enough
stack is still available. Once that patch gets merged I'll
change VLAN in a similar way.

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