From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from snark.thyrsus.com (static-71-162-243-5.phlapa.fios.verizon.net [71.162.243.5]) by huchra.bufferbloat.net (Postfix) with ESMTP id 41AAA200890 for ; Tue, 13 Mar 2012 18:19:15 -0700 (PDT) Received: by snark.thyrsus.com (Postfix, from userid 1000) id E4A3A40617; Tue, 13 Mar 2012 21:18:56 -0400 (EDT) Date: Tue, 13 Mar 2012 21:18:56 -0400 From: "Eric S. Raymond" To: tz Message-ID: <20120314011856.GA25558@thyrsus.com> References: <20120313230612.GA24800@thyrsus.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Organization: Eric Conspiracy Secret Labs X-Eric-Conspiracy: There is no conspiracy User-Agent: Mutt/1.5.21 (2010-09-15) Cc: thumbgps-devel@lists.bufferbloat.net Subject: Re: [Thumbgps-devel] Project clarification X-BeenThere: thumbgps-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list Reply-To: esr@thyrsus.com List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Mar 2012 01:19:15 -0000 tz : > On Tue, Mar 13, 2012 > at 7:06 PM, Eric S. Raymond wrote: > > One the one hand, ordinary GPS can yield time-service accuracy down > > to a second with jitter on the close order of a hundred milliseconds. > > This is not as good as NTP, which is generally believed accurate to 10us > > (but may not be - that's part of what we want to check). > > Maybe LAN NTP can go 10uS - microseconds, but pool.ntp.org is more > like 10mS - milliseconds Right, I typoed the prefix - 1 millisecond is the goal. -- Eric S. Raymond