From: Jeff Kirsher <redacted>
Date: Wed, 24 Dec 2008 14:31:42 -0800

This patch removes tx head writeback as it was found to not provide a
significant improvement in tx performance and on some systems has been seen
to cause a performance degredation due to partial cache line writes.

Signed-off-by: Alexander Duyck <redacted>
Signed-off-by: Jeff Kirsher <redacted>

Applied.