netdev - Re: [RFC v2] mac80211: assign needed

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Date:	Mon, 05 May 2008 21:57:36 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	David Miller <davem@...emloft.net>
Cc:	tomasw@...il.com, linville@...driver.com, netdev@...r.kernel.org,
	linux-wireless@...r.kernel.org
Subject: Re: [RFC v2] mac80211: assign needed_headroom/tailroom for netdevs


> My bad, it merely allows for devices that can handle
> frag lists in sk_buff as transmit packets.

:)

> I guess you could use this, btw, to take on arbitrary things
> to the front of frames to handle big headers.  But that's more
> expensive than just getting the LL header length right.

Not necessarily because we seem to be getting a lot of cloned frames
that we need to copy all the time. If we would remove the ethernet
header and stick that skb into the fraglist of a new skb we'd win.

johannes

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