git: igb: Add comment for WTHRESH and header write back mode.

[Sepherosa Ziehau]

commit 54691ff189b6326954529a2597f012ca4ffd8636
Author: Sepherosa Ziehau <sephe at dragonflybsd.org>
Date:   Sat Jul 7 14:35:52 2012 +0800

    igb: Add comment for WTHRESH and header write back mode.

Summary of changes:
 sys/dev/netif/igb/if_igb.c |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/54691ff189b6326954529a2597f012ca4ffd8636


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