Re: [ntp:questions] NTP time compare util
Steve Kostecke wrote: On 2012-08-28, David Woolley david@ex.djwhome.demon.invalid wrote: Steve Kostecke wrote: ntpd polls your chosen time servers and determine which is aparently the best. ntpd continuously steers your system clock towards the chosen time server. Unless it has changed recently, it steers towards an average of all the servers that haven't been eliminated. The best one is only used to set the stratum and the downstream error statistics (root distance, and root dispersion). At one time the averaging was weighted. I'm not completely sure if even that is true, now. *plonk* That's a weird response to a low volume poster who has never been challenged when they have made this point before. ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] Timing GPS recommendations
In article cabbxvhtpo4jvq_fvxqkxlytn0asvq25j+caxgovy_y_m9rl...@mail.gmail.com, albertson.ch...@gmail.com says... Actually can CAN set a remote clock very accurately. This is how NTP works and what it idoes best.NTP uses the Internet to synchronise clocks to MUCH higher precision than the delay in Internet messages. Snip Chris Albertson Redondo Beach, California But, as I've found, only if The Internet has predictable and stable ping times. When your ISP is so clagged up with traffic, or as a home user you get trottled during the day, then the ping times wander between a few 10's of uS, and often over 1.5 seconds at random, ping to ping, even NTP can't cope with that! Dave B. ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
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From: DaveB g8...@uko2.co.uk Newsgroups: comp.protocols.time.ntp Organization: EMV Message-ID: mpg.2aa7e3d54289025b989...@aioe.org References: mpg.2a3016d85d168344989...@news.btopenworld.com 5925612d-a31c-44d1-b49e-8d0e6aa79...@googlegroups.com jvq9f1$o7k$1...@dont-email.me b0590fa0-d352-4ce0-8504-770846090...@googlegroups.com NNTP-Posting-Host: N1RhQ2TM/etvJBX+64EmVg.user.speranza.aioe.org Mime-Version: 1.0 X-Complaints-To: ab...@aioe.org User-Agent: MicroPlanet-Gravity/2.9.12 X-Notice: Filtered by postfilter v. 0.8.2 X-Received-Bytes: 2501 To: questions@lists.ntp.org Date: Wed, 29 Aug 2012 09:32:08 +0100 X-SA-Exim-Connect-IP: 2001:4f8:fff7:1::4 X-SA-Exim-Rcpt-To: questions@lists.ntp.org X-SA-Exim-Mail-From: n...@ntp.org X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on mail1.ntp.org X-Spam-Level: *** X-Spam-Status: No, score=3.3 required=5.0 tests=BAYES_00,MISSING_DATE, MISSING_FROM, MISSING_HEADERS, MISSING_MID, MISSING_SUBJECT, NORMAL_HTTP_TO_IP, RP_MATCHES_RCVD autolearn=no version=3.3.2 X-SA-Exim-Version: 4.2 X-SA-Exim-Scanned: Yes (on mail1.ntp.org) Subject: Re: [ntp:questions] Have Pi, have GPS = low powered NTP server? X-BeenThere: questions@lists.ntp.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Mailing list for people with questions about NTP \(gatewayed to the USENET newsgroup comp.protocols.time.ntp\) questions.lists.ntp.org List-Unsubscribe: http://lists.ntp.org/options/questions, mailto:questions-requ...@lists.ntp.org?subject=unsubscribe List-Archive: http://lists.ntp.org/pipermail/questions List-Post: mailto:questions@lists.ntp.org List-Help: mailto:questions-requ...@lists.ntp.org?subject=help List-Subscribe: http://lists.ntp.org/listinfo/questions, mailto:questions-requ...@lists.ntp.org?subject=subscribe Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Errors-To: questions-bounces+archive=mail-archive@lists.ntp.org Sender: questions-bounces+archive=mail-archive@lists.ntp.org X-pstn-neptune: 0/0/0.00/0 X-pstn-levels: (S:94.50887/99.9 CV:99.9000 FC:95.5390 LC:95.5390 R:95.9108 P:95.9108 M:97.0282 C:98.6951 ) X-pstn-dkim: 0 skipped:not-enabled X-pstn-settings: 4 (1.5000:1.5000) s cv gt3 gt2 gt1 r p m c X-pstn-addresses: from g8...@uko2.co.uk [294/10] In article b0590fa0-d352-4ce0-8504-770846090...@googlegroups.com, pktr...@gmail.com says... Hi, I have my pi running on the web right now at http://121.221.94.250/ I made a small web site to expose various parameters in realtime. Still waiting for my gps unit, but I am pretty happy with millisecond from live internet sources. PPS is next. The website needs a little more polish, but the basics are there. http://121.221.94.250/ Unreachable, 08:19 UTC Wednesday 29th August. I've seen on another site, that people using the chipset based serial port with GPS and other devices, and have *Much* better results than when using a USB hosted serial port. There are still issues with the Pi's network port, as that aparrently is a USB driven device on board, resulting in more latency than might be expected otherwise, and some extra variability too. I also found that the Pi would lock up and need a power cycle, if left running the default NTPD service for anything more than two or three days. It was predictable and repeatable, but I've not tried updating the OS (or NTP) and doing that again. That was using the original Debian distro for the thing. At this exact time, it's back in it's box while I make room for it by doing other things, much more important according to domestic management. I have other plans for it. Regards. Dave B. ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] Have Pi, have GPS = low powered NTP server?
Hi Dave, good feedback. I have had the pi running for several days now without a hitch. Due to my dynamic IP (pending a static ip), you can find the pi and associated ntp server at: http://secondthoughts.no-ip.org I made a small realtime time-series plot and a page displaying ntpq info so I can more easily review performance. I fully intend to use serial GPS+PPS when it arrives (slow boat from china), but will continue to build the web site for monitoring the service in the meantime. I am currently building the web page to add additional ref clocks. I do se occasional spikes in the offset. you can see them in the timer series plots which are based on loopstats files. I would hope they disappear when I have pps. I am not sure if this is pi/ethernet or the refclock (which is not close-by). My final use-case is on our internal LAN's at work where we have a GPS unit always on hand, but this is a homework project right now, so the going is a bit slow. I have not seen any lockups yet, and will try to keep it running as long as possible without a reboot. If you have seen it, I am sure it will pop up for me as well. If we get them, the pi is a showstopper for me. regards pk -Original Message- From: questions-bounces+p.kennedy=fugro.com...@lists.ntp.org [mailto:questions-bounces+p.kennedy=fugro.com...@lists.ntp.org] On Behalf Of DaveB Sent: Wednesday, 29 August 2012 4:32 PM To: questions@lists.ntp.org Subject: Re: [ntp:questions] Have Pi, have GPS = low powered NTP server? In article b0590fa0-d352-4ce0-8504-770846090...@googlegroups.com, pktr...@gmail.com says... Hi, I have my pi running on the web right now at http://121.221.94.250/ I made a small web site to expose various parameters in realtime. Still waiting for my gps unit, but I am pretty happy with millisecond from live internet sources. PPS is next. The website needs a little more polish, but the basics are there. http://121.221.94.250/ Unreachable, 08:19 UTC Wednesday 29th August. I've seen on another site, that people using the chipset based serial port with GPS and other devices, and have *Much* better results than when using a USB hosted serial port. There are still issues with the Pi's network port, as that aparrently is a USB driven device on board, resulting in more latency than might be expected otherwise, and some extra variability too. I also found that the Pi would lock up and need a power cycle, if left running the default NTPD service for anything more than two or three days. It was predictable and repeatable, but I've not tried updating the OS (or NTP) and doing that again. That was using the original Debian distro for the thing. At this exact time, it's back in it's box while I make room for it by doing other things, much more important according to domestic management. I have other plans for it. Regards. Dave B. ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] Have Pi, have GPS = low powered NTP server?
In article 082899b024c30d459ba9acd1c5e58119042c7...@msd9.msd.local, p.kenn...@fugro.com.au says... Hi Dave, good feedback. I have had the pi running for several days now without a hitch. Due to my dynamic IP (pending a static ip), you can find the pi and associated ntp server at: http://secondthoughts.no-ip.org I made a small realtime time-series plot and a page displaying ntpq info so I can more easily review performance. Snip regards pk Nice page! And though I dont (yet) read javascript code, I like the layout style. How easy/dificult would it be to adapt that page to run on another system? Dave B. ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] Have Pi, have GPS = low powered NTP server?
DaveB writes: I also found that the Pi would lock up and need a power cycle, if left running the default NTPD service for anything more than two or three days. When you get time please file a bug report. I've had one running Chrony for about a month. It's using Raspbian. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
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From: E-Mail Sent to this address will be added to the BlackLists Null@BlackList.Anitech-Systems.invalid Newsgroups: comp.protocols.time.ntp Organization: blackl...@anitech-systems.com Message-ID: k1lsdn$52u$1...@dont-email.me References: mn.c3407dc8a45fad15.106...@nospam.tiscali.co.uk k18705$708$1...@dont-email.me 86ligz8fdf@gray.siamics.net slrnk3pfc1.lom.koste...@stasis.kostecke.net 86wr0i731s@gray.siamics.net Mime-Version: 1.0 Injection-Date: Wed, 29 Aug 2012 20:00:55 + (UTC) Injection-Info: mx04.eternal-september.org; posting-host=4bfbd8b43cf68fb325fbc66b07498278; logging-data=5214; mail-complaints-to=ab...@eternal-september.org; posting-account=U2FsdGVkX1+mHDGRadjv5v0rinuCsVF8T//hrS+zXak= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.23) Gecko/20090812 Thunderbird/2.0.0.23 Mnenhy/0.7.6.666 In-Reply-To: 86wr0i731s@gray.siamics.net Cancel-Lock: sha1:Laxgj1+92iYtJN2RUcLbDgyma3M= X-Received-Bytes: 1909 To: questions@lists.ntp.org Date: Wed, 29 Aug 2012 13:00:54 -0700 X-SA-Exim-Connect-IP: 2001:4f8:fff7:1::4 X-SA-Exim-Rcpt-To: questions@lists.ntp.org X-SA-Exim-Mail-From: n...@ntp.org X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on mail1.ntp.org X-Spam-Level: *** X-Spam-Status: No, score=3.3 required=5.0 tests=BAYES_00,MISSING_DATE, MISSING_FROM, MISSING_HEADERS, MISSING_MID, MISSING_SUBJECT, RP_MATCHES_RCVD autolearn=no version=3.3.2 X-SA-Exim-Version: 4.2 X-SA-Exim-Scanned: Yes (on mail1.ntp.org) Subject: Re: [ntp:questions] NTP time compare util X-BeenThere: questions@lists.ntp.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Mailing list for people with questions about NTP \(gatewayed to the USENET newsgroup comp.protocols.time.ntp\) questions.lists.ntp.org List-Unsubscribe: http://lists.ntp.org/options/questions, mailto:questions-requ...@lists.ntp.org?subject=unsubscribe List-Archive: http://lists.ntp.org/pipermail/questions List-Post: mailto:questions@lists.ntp.org List-Help: mailto:questions-requ...@lists.ntp.org?subject=help List-Subscribe: http://lists.ntp.org/listinfo/questions, mailto:questions-requ...@lists.ntp.org?subject=subscribe Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Errors-To: questions-bounces+archive=mail-archive@lists.ntp.org Sender: questions-bounces+archive=mail-archive@lists.ntp.org X-pstn-levels: (S:99.9/99.9 CV:99.9000 FC:95.5390 LC:95.5390 R:95.9108 P:95.9108 M:97.0282 C:98.6951 ) X-pstn-dkim: 0 skipped:not-enabled X-pstn-settings: 4 (1.5000:1.5000) s cv gt3 gt2 gt1 r p m c X-pstn-addresses: from Null@BlackList.Anitech-Systems.invalid [294/10] Ivan Shmakov wrote: Unless I be mistaken, there's no option for ntpd /not/ to set the system clock. I think you are. What about setting noselect on all of the ntp servers you are monitoring? -- E-Mail Sent to this address blackl...@anitech-systems.com will be added to the BlackLists. ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
Re: [ntp:questions] NTP time compare util
I had a think about this oddball question last night, and decided to explore it a little further. Assuming I understand the original question from Harry Bloomfield, it came to me that the we already have the data Harry is looking for in the peerstats files, ie we have a data record for each response from each configured server... 1.pool.ntp.org Time, offset, jitter, delay Time, offset, jitter, delay Time, offset, jitter, delay an.other.server Time, offset, jitter, delay Time, offset, jitter, delay Time, offset, jitter, delay Harry was looking for a display of this, so I spent a couple of hours and made something which displays the live data... http://secondthoughts.no-ip.org/page-peerstats.php You will see from the plots, I am still fooling round with the conf file, but general principle is to make a utility which can display a 24hour data 'time quality' from several servers at once (Harry asked for the 'time' from several servers, but I interpret that to mean the quality of the time from those servers, as all the humans I know cannot deal with milliseconds) Maybe Harry is really after super-humans (ie the borg), so they are all in collective sync, but this is as good as I can do right now. regards ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
