From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by vger.rutgers.edu via listexpand id ; Fri, 31 Mar 2000 18:09:15 -0500 Received: by vger.rutgers.edu id ; Fri, 31 Mar 2000 18:08:27 -0500 Received: from mail.webmaster.com ([209.133.28.73]:51067 "EHLO shell.webmaster.com") by vger.rutgers.edu with ESMTP id ; Fri, 31 Mar 2000 18:00:54 -0500 From: "David Schwartz" To: Cc: "'LINUX-KERNEL mailing list'" Subject: RE: Time synchronization between two LINUX computer Date: Fri, 31 Mar 2000 15:05:04 -0800 Message-ID: <000901bf9b65$8c85bbc0$0100000a@youwant.to> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook 8.5, Build 4.71.2377.0 In-Reply-To: Importance: Normal Sender: owner-linux-kernel@vger.rutgers.edu > I would think so since, for instance, file date/times don't have much > resolution. However, the original inquiry implied microsecond resolution > time-difference between machines. On my home LAN, I have quite a few machines running NTP. Here's what a 'xntpdc -p' looks like on one of 'em: st poll reach delay offset disp ======================================================================= + A 2 1024 377 0.00050 -0.004370 0.00218 = B 1 256 377 0.00020 0.000176 0.00006 - C 2 64 36 0.00861 0.000055 1.93866 * D 1 128 377 0.00018 0.000174 0.00005 - E 2 64 16 0.00032 0.001583 1.93872 - F 2 256 377 0.00844 0.000222 0.00333 - G 2 512 367 0.00069 -0.000021 0.06850 + H 2 256 377 0.00334 0.000112 0.00545 - I 2 512 377 -0.0150 -0.008419 0.01424 A is an Irix machine on my LAN. B is a local stratum one public time server. C is a customer's machine on a remote WAN. D is a local stratum one public time server. E is a FreeBSD 3 box on my LAN (SMP. FreeBSD SMP doesn't keep very good time). F is a customer's machine on a remote WAN. G is my UltraSparc. H is my local Cisco router. I is a Windows 98 box. The machine I ran this on is a Linux box. You'll notice that <1ms resolution is possible between Linux and FreeBSD UP machines with recent kernels. DS - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/