From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andi Kleen Subject: Re: [RFC PATCH 00/13] hardware time stamping + igb example implementation Date: Wed, 12 Nov 2008 17:06:33 +0100 Message-ID: <491AFF09.8070907@linux.intel.com> References: <1226414697.17450.852.camel@ecld0pohly> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, Octavian Purdila , Stephen Hemminger , Ingo Oeser , John Ronciak , Eric Dumazet , Oliver Hartkopp To: Patrick Ohly Return-path: Received: from mga05.intel.com ([192.55.52.89]:60462 "EHLO fmsmga101.fm.intel.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750986AbYKLQGY (ORCPT ); Wed, 12 Nov 2008 11:06:24 -0500 In-Reply-To: <1226414697.17450.852.camel@ecld0pohly> Sender: netdev-owner@vger.kernel.org List-ID: 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