netdev - Re: [RFC PATCH 00/13] hardware time stamping + igb example implementation

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Message-ID: <491AFF09.8070907@linux.intel.com>
Date:	Wed, 12 Nov 2008 17:06:33 +0100
From:	Andi Kleen <ak@...ux.intel.com>
To:	Patrick Ohly <patrick.ohly@...el.com>
CC:	netdev@...r.kernel.org, Octavian Purdila <opurdila@...acom.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Ingo Oeser <netdev@...eo.de>,
	John Ronciak <john.ronciak@...el.com>,
	Eric Dumazet <dada1@...mosbay.com>,
	Oliver Hartkopp <oliver@...tkopp.net>
Subject: Re: [RFC PATCH 00/13] hardware time stamping + igb example	implementation

As a general comment on the patch series I'm still a little sceptical
the time stamp offset method is a good idea. Since it tries to approximate
several unsynchronized clocks the result will always be of a little poor
quality, which will likely lead to problems sooner or later (or rather
require ugly workarounds in the user).

I think it would be better to just bite the bullet and add new fields
for this to the skbs. Hardware timestamps are useful enough to justify
this.

-Andi

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