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Date:	Mon, 07 Jul 2014 14:08:57 -0700
From:	Chad Reese <>
To:	Richard Cochran <>
CC:	Willem de Bruijn <>,,
	David Miller <>,
	Eric Dumazet <>,
	Stephen Hemminger <>,
	Chad Reese <>,
	David Daney <>
Subject: Re: [PATCH net-next v2 1/8] net-timestamp: explicit SO_TIMESTAMPING
 ancillary data struct

On 07/07/2014 01:18 PM, Richard Cochran wrote:
> On Mon, Jul 07, 2014 at 12:44:44PM -0700, Chad Reese wrote:
>> For Octeon, you can optionally use the hardware timestamp as the
>> system clock reference. Most people don't, but it is the only way to
>> get the system time to be accurate. 1588 can synchronize two Octeon
>> boards to less than 1ns for the hardware timer. The Linux software
>> timers is always farther off.
> Did you mean 1us ?

No, it was 1ns. Who would go through all this effort if all you wanted 
was 1us?  Our requirement was within 20ns, but me managed to get 1ns 
with a lab setup. We had to be careful that the scope probes used in the 
measurement were the same length.



Chad Reese <>
Cavium Networks
Phone: 408 - 943 - 7183
Cell: 321 - 438 - 7753

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