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

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

On May 24, 2010, at 7:26 AM, Mcmillan, Scott A wrote:

> [My apologies if this double posts.  The mail server didn't care for the first submission.]
>
> This patch adds the capability to select the packet timestamp source.

Is there ever any reason *NOT* to use the hardware timestamp if it's available?

> A new command line option was added to tcpdump, -j, to specify the source of the packet timestamp.  Valid options are 
> 'raw' to use the raw NIC HW timestamp and 'nic' to use the NIC HW timestamp transformed into the system clock basis.

Is the raw timestamp in the form of seconds since January 1, 1970, 00:00:00 UTC, plus fractions of a second?

I assume "NIC HW timestamp transformed into the system clock basis" means that the time stamp in question *is* in the 
form of seconds since January 1, 1970, 00:00:00 UTC, plus fractions of a second?

If "raw" is not in that form, and "nic" is in that form, is there any reason to use "raw"?-
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