From owner-freebsd-current Sun Jan 2 14:38:29 2000 Delivered-To: freebsd-current@freebsd.org Received: from Genesis.Denninger.Net (209-176-244-82.inil.com [209.176.244.82]) by hub.freebsd.org (Postfix) with ESMTP id 4FB78150F6 for ; Sun, 2 Jan 2000 14:38:15 -0800 (PST) (envelope-from karl@Genesis.Denninger.Net) Received: (from karl@localhost) by Genesis.Denninger.Net (8.9.3/8.8.2) id QAA25955; Sun, 2 Jan 2000 16:38:02 -0600 (CST) Message-ID: <20000102163802.A25936@Denninger.Net> Date: Sun, 2 Jan 2000 16:38:02 -0600 From: Karl Denninger To: Warner Losh Cc: current@FreeBSD.ORG Subject: Re: xntpd - VERY old folks, how about updating? :-) References: <20000102161029.A25883@Denninger.Net> <20000102103732.A23004@Denninger.Net> <20000102094459.B22738@Denninger.Net> <8426.946828544@critter.freebsd.dk> <20000102103732.A23004@Denninger.Net> <200001022133.OAA31402@harmony.village.org> <20000102161029.A25883@Denninger.Net> <200001022232.PAA31807@harmony.village.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.93.2i In-Reply-To: <200001022232.PAA31807@harmony.village.org>; from Warner Losh on Sun, Jan 02, 2000 at 03:32:00PM -0700 Organization: Karl's Sushi and Packet Smashers X-Die-Spammers: Spammers cheerfully broiled for supper and served with ketchup! Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Sun, Jan 02, 2000 at 03:32:00PM -0700, Warner Losh wrote: > In message <20000102161029.A25883@Denninger.Net> Karl Denninger writes: > : Why spend twice what Mr. Schwartz seems to want to charge? > > Because we need a PPS that is < 10nS from the true start of second for > our application? 1uS is really really bad for the timing geeks in the > audience. > > Warner And on what hardware do you think you can obtain 10ns resolution RELIABLY at the software level in the Unix environment and under FreeBSD? Answer: NONE! The actual usable resolution of a timing source is determined by the maximum slop in ANY part of the complete system. I challenge you to get actual REPEATABLE 10ns results while a multi-tasking anything is running on the recipient of that data. - -- Karl Denninger (karl@denninger.net) Web: http://childrens-justice.org Isn't it time we started putting KIDS first? See the above URL for a plan to do exactly that! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message