netdev - Re: [net-next PATCH 1/3] vxge: always enable hardware time stamp

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Date:	Sun, 10 Apr 2011 18:58:45 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jdmason@...zu.us
Cc:	netdev@...r.kernel.org
Subject: Re: [net-next PATCH 1/3] vxge: always enable hardware time stamp

From: Jon Mason <jdmason@...zu.us>
Date: Fri,  8 Apr 2011 16:11:21 -0500

> Hardware time stamp calculation can only be enabled by the privileged
> function. Enable it always by default and simply use the ethtool
> interface to set a flag to indicate whether or not the respective
> function driver should indicate the timestamp along with the received
> packet.
> 
> Also, make certain fields in vxge_hw_device_config bit-fields to reduce
> the size of the struct.
> 
> Signed-off-by: Jon Mason <jdmason@...zu.us>

Doesn't this have some performance or latency impact?

I think it should be stay off by default, people who want this know
they want it and can turn it on if they want to.
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