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

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

On May 27, 2010, at 9:48 AM, Mcmillan, Scott A wrote:

> This is an updated patch for tcpdump-4.1.1 to add the capability to select hw timestamps via the -j command line 
> option.  The usage has been simplified: -j now takes no argument, and uses the hw timestamp transformed into the 
> system clock basis corresponding to "-j nic" from the previous patch.
>
> I left the more generic libpcap infrastructure in place to support future extensions that may want more precise 
> selection of the timestamp source.

I could see devices other than the Intel adapters in question using this; for example, CACE Technologies' TurboCap 
devices:

        http://www.cacetech.com/products/turbocap.html

offer high-precision time stamping with a busy loop or lower-precision time stamping with the adapter generating the 
time stamps (as well as no timestamping, but that's probably best used with pcap-ng, where you can have a packet block 
without a time stamp, so the application knows there's no time stamp).-
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