[Beowulf] precise synchronization of system clocks

[Lux, James P]

James Lux, P.E.
Task Manager, SOMD Software Defined Radios
Flight Communications Systems Section
Jet Propulsion Laboratory
4800 Oak Grove Drive, Mail Stop 161-213
Pasadena, CA, 91109
+1(818)354-2075 phone
+1(818)393-6875 fax

> -----Original Message-----
> From: beowulf-bounces at beowulf.org
> [mailto:beowulf-bounces at beowulf.org] On Behalf Of Lawrence Stewart
> Sent: Monday, September 29, 2008 4:00 PM
> To: Lombard, David N
> Cc: Beowulf Mailing List; Lawrence Stewart
> Subject: Re: [Beowulf] precise synchronization of system clocks
>
> >
> > The IEEE-1588 "Precision Time Protocol" can provide such levels of
> > global clock synchronization.
> >
>
> That's the one I was trying to remember, but I didn't compose a good
> query and couldn't find it.
>
> IIRC the NIC timestamps arriving packets right off the wire?

Exactly..

   We have
> an on-chip logic analyzer
> gadget that can do that, but the synchronization problem we have is
> only to find one-time
> offsets, so we didn't need to go this deep.
>
> -L
>
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