netdev - Lower wake up time when phy enter lower mode

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Date:	Wed, 7 Nov 2012 10:52:32 +0800
From:	Frank Li <lznuaa@...il.com>
To:	Richard Cochran <richardcochran@...il.com>, netdev@...r.kernel.org
Subject: Lower wake up time when phy enter lower mode

Richard:

          Recently, I found out the path delay will increase about
20us suddenly in something when connect two iMX6 board and Ethernet
work on 1G mode.
          The reason is that the PHY enter lower mode automatically
when no package send and receive. It takes some time to recover and
send out package by PHY but MAC think package have sent and sample
time stamper.
          Do you meet such case?  I can workaround it by two method
               1. disable phy lower power feature.
               2. add some dummy package before SYNC package.

Best regards
Frank Li
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