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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