From: Francois Romieu <romieu@fr.zoreil.com>

The device does not support the whole mtu range it claims. Experimenting
with the Tx threshold and/or the PCI burst size does not seem to improve
the behavior.
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>