Subject: Re: [PATCH net-next v2 1/8] net-timestamp: explicit SO_TIMESTAMPING ancillary data struct

From: Richard Cochran <[email-masked]>
Date: Tue, 8 Jul 2014 07:49:19 +0200

On Mon, Jul 07, 2014 at 02:08:57PM -0700, Chad Reese wrote:
> 
> 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.

Well, in a lab, carefully compensating for phy delays, etc, etc,
achieving 1ns is one thing. As a general statement, telling the
public, "our PTP hardware synchronizes to within one nanosecond",
is quite another thing.

Thanks,
Richard