netdev - Re: [E1000-devel] [PATCH] fixing hw timestamping in igb

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Date:	Wed, 9 Feb 2011 10:51:07 +0100
From:	Anders Berggren <anders@...on.se>
To:	Joe Perches <joe@...ches.com>
Cc:	"Ronciak, John" <john.ronciak@...el.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: Re: [E1000-devel] [PATCH] fixing hw timestamping in igb

On Feb 9, 2011, at 9:56 AM, Joe Perches wrote:

> Perhaps you mean 8 nanosecond resolution?
> Is documentation available for this claim?

To clarify; we haven't proven this either mathematically not in a laboratory (looking at actual data transmissions). Also, it's the jitter accuracy we're concerned with. We have simply assumed that the jitter of two independent servers (exchanging timestamps) over a very short cable is an approximation of jitter accuracy.

As you say; if the resolution is 8 ns, the accuracy is of course worse than 8 ns. So far, we have however assumed the accuracy to be within the same order of magnitude.--
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