From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753810AbbJOFlt (ORCPT ); Thu, 15 Oct 2015 01:41:49 -0400 Received: from mail-wi0-f175.google.com ([209.85.212.175]:32813 "EHLO mail-wi0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750732AbbJOFlr (ORCPT ); Thu, 15 Oct 2015 01:41:47 -0400 Date: Thu, 15 Oct 2015 07:41:43 +0200 From: Richard Cochran To: Christopher Hall Cc: Thomas Gleixner , jeffrey.t.kirsher@intel.com, hpa@zytor.com, mingo@redhat.com, john.stultz@linaro.org, peterz@infradead.org, x86@kernel.org, intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, kevin.b.stanton@intel.com Subject: Re: [PATCH v4 1/4] Produce system time from correlated clocksource Message-ID: <20151015054142.GA4784@netboy> References: <1444675522-4198-1-git-send-email-christopher.s.hall@intel.com> <1444675522-4198-2-git-send-email-christopher.s.hall@intel.com> <20151013045832.GA2437@netboy> <20151013083113.GA1931@localhost.localdomain> <20151013211224.GA19242@netboy> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Oct 14, 2015 at 07:34:03PM -0700, Christopher Hall wrote: > I hope this is helpful. Thanks. So the DSP does not produce or consume system time stamps. Fine. Still I fail to understand why you need the system time. Thomas seems to say that there are *other* applications that will want to transform device time into system time, but why does your audio application use the system time, when the audio-to-ptp time is directly available, without any man in the middle? Thanks, Richard