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On Thu, Jan 26, 2006 at 11:52:04AM +0100, Manuel Bouyer wrote:
> On Wed, Jan 25, 2006 at 08:50:31PM +0100, Pavel Cahyna wrote:
> >=20
> > Do you have any explanation why does it help?
>=20
> The vlan driver has to strip these 4 bytes from the frame.
> This is done by a memmove() of the ethernet header 4 bytes ahead
> (se vlan_inout()). This has a cost, and as ether_header isn't 32bit-align=
ed
> it has more cost one some architecture than others.

Splitting the mbuf chain would be even more expensive, I guess, than=20
copying 14 octets....

	-is
--=20
seal your e-mail: http://www.gnupg.org/

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