Re: [RFC PATCH 0/2]: hw timestamp support

[Guy Harris <guy () alum mit edu>]

On May 26, 2010, at 9:03 AM, Mcmillan, Scott A wrote:

> Both the 'raw' and 'nic' timestamps are in the form of seconds since the Unix epoch, plus fractions of a second.  
> Please see my response to Darren for more info on the difference between these two timestamp sources.

Which reply was that?  I saw a reply with

> Darren,
>
> Various flavors of timestamping are available on Intel NICs.  For example, the 82576 can timestamp PTP packets in hw, 
> but not general purpose packets.  My guess is that the 82575 behaves like the 82576 with respect to hw timestamping, 
> but I'm not sure. Please refer to the product docs.  
>
> In the Linux driver, the PTP hw timestamping and general purpose packet timestamping paths have much in common. (see 
> IGB_PER_PKT_TIMESTAMP in the Linux igb stable driver, http://sourceforge.net/projects/e1000/files/).  
>
> Scott

Does that mean that the additional information is in the product documentation and/or the Linux driver code?-
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