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Scott Laird<p>Okay, it's time for the big <a href="https://hachyderm.io/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a> and <a href="https://hachyderm.io/tags/ptp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ptp</span></a> wrap-up post. My week-long timing project spiraled out of control and turned into a two month monster, complete with 7 (ish?) GPS timing devices, 14 different test NICs, and a dozen different test systems.</p><p>What'd I learn along the way? See <a href="https://scottstuff.net/posts/2025/06/10/timing-conclusions/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">scottstuff.net/posts/2025/06/1</span><span class="invisible">0/timing-conclusions/</span></a> for the full list (and links to measurements and experimental results), but the top few are:</p><p>1. It's *absolutely* possible to get single-digit nanosecond time syncing with NTP between a pair of Linux systems with Chrony in a carefully-constructed test environment. Outside of a lab, 100-500 ns is probably more reasonable with NTP on a real network, and even that requires carefully selected NICs. But single-digit nanoseconds *are* possible. NTP isn't just for millisecond-scale time syncing.<br>2. Generally, PTP on the same hardware shows similar performance to NTP in a lab setting, with a bit less jitter. I'd expect it to scale *much* better in a real network, though. However, PTP mostly requires higher-end hardware (especially switches) and a bit more engineering work. Plus many older NICs just aren't very good at PTP (especially ConnectX-3s).<br>3. Intel's NICs, *especially* the E810 and to a lesser extent the i210 are very good at time accuracy. Unfortunately their X710 isn't as good, and the i226 is mixed. Mellanox is less accurate in my tests, with 200ns of skew, but still far better than Realtek and other consumer NICs.<br>4. GPS receivers aren't really *that* accurate. Even good receivers "wander" around 5-30 ns from second to second.<br>5. Antennas are critical. The cheap, flat window ones aren't a good choice for timing work. (Also, they're not actually supposed to be used in windows, they generally want a ground plane).<br>6. Your network probably has more paths with asymmetrical timing in it than you'd have expected. ECMP, LACP, and 2.5G/5G/10Gbase-T probably all negatively impact your ability to get extremely accurate time.<br> <br>Anyway, it's been a fun journey. I had a good <a href="https://hachyderm.io/tags/time" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>time</span></a>.</p>
Scott Laird<p>Okay, hopefully that's it for <a href="https://hachyderm.io/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a> for now:</p><p><a href="https://scottstuff.net/posts/2025/05/19/ntp-limits/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">scottstuff.net/posts/2025/05/1</span><span class="invisible">9/ntp-limits/</span></a></p><p>I'm seeing up to 200 ns of difference between various GPS devices on my desk (one outlier, should really all be closer to that) plus 200-300 ns of network-induced variability on NTP clients, giving me somewhere between 200 and 500 ns of total error, depending on how I measure it.</p><p>So, it's higher than I'd really expected to see when I started, but *well* under my goal of 10 μS.</p>
Scott Laird<p>Ah ha! Here we go, a reasonably fundamental limit to <a href="https://hachyderm.io/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a> accuracy on my network.</p><p>I'm starting think that ~300ns is about the limit of time accuracy on my network, and even that's probably a bit optimistic.</p><p>Here's one solid example. I have 2 identical NTP servers (plus several non-identical ones that I'm ignoring here) with their own antennas connected at different points on my network. Then I have 8 identical servers syncing their time from NTP once per second using Chrony.</p><p>This is a graph of the delta between NTP1's 1-hour median offset and NTP2's 1-hour median offset, showing one line for each server.</p><p>Notice that half of them think that NTP1 is faster and half think that NTP2 is faster.</p><p>This is almost certainly due to ECMP; each server is attached to 2 L3 switches. Each NTP server is connected to a different L2 switch, and each of those L2 switches are connected to both L3 switches via MLAG.</p><p>For some reason, one ECMP path seems to be faster than the other, so server-NTP pairs that hash onto the fast path go 200-400ns faster than server-NTP pairs that take the other path.</p>
gyptazy<p>I’m already providing public <a href="https://mastodon.gyptazy.com/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a> systems to the NTPPool project for more than 10 yrs and with the BoxyBSD locations, I bring them all to the NTPool - starting now with <a href="https://mastodon.gyptazy.com/tags/Milan" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Milan</span></a> (IT), Kansas (US) &amp; Amsterdam (NL).</p>
JJ Celery<p>Let's take a moment to remember the guy who made sure we don't have to change Every Goddamn Clock today, David L. Mills, creator of Network Time Protocol (NTP) who passed last year.</p><p>My wristwatch is synced to my phone, which is synced to the internet, which knows that time it is right now thanks to David Mills. Cheers to his memory 🥃</p><p><a href="https://cse.engin.umich.edu/stories/remembering-alum-david-mills-who-brought-the-internet-into-perfect-time//" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">cse.engin.umich.edu/stories/re</span><span class="invisible">membering-alum-david-mills-who-brought-the-internet-into-perfect-time//</span></a></p><p><a href="https://mastodon.ie/tags/DST" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DST</span></a> <a href="https://mastodon.ie/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a> <a href="https://mastodon.ie/tags/FOSS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FOSS</span></a></p>
fascism is treifTech frustration, minor?
Jason Weatherly<p>So, quick bit of advice: if you purchase an NTP server, make sure you actually use it on things like DNS. Evidently both name servers were like 20 minutes off and none of the TXT entries were being successfully added. <a href="https://social.linux.pizza/tags/homelab" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>homelab</span></a> <a href="https://social.linux.pizza/tags/dns" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>dns</span></a> <a href="https://social.linux.pizza/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a></p>
Santiago<p>Nuestro servidor NTP en Undernet, responde al 18,3% de las consultas de sincronización de tiempo NTP de Uruguay según la estadística de NTP-Pool <a href="https://www.ntppool.org/scores/200.40.115.74" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">ntppool.org/scores/200.40.115.</span><span class="invisible">74</span></a> <a href="https://mastodon.uy/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a> <a href="https://mastodon.uy/tags/tiempo" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>tiempo</span></a> <a href="https://mastodon.uy/tags/network" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>network</span></a> <a href="https://mastodon.uy/tags/time" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>time</span></a> <a href="https://mastodon.uy/tags/protocol" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>protocol</span></a> <a href="https://mastodon.uy/tags/internet" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>internet</span></a> <a href="https://mastodon.uy/tags/undernet" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>undernet</span></a> <a href="https://mastodon.uy/tags/uruguay" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>uruguay</span></a></p>
Da Linux beardude<p>Okay, ntpd doesn't exist on Artix Linux runit ISO, but openntpd does!</p><p>Alright, okay. A little "different" from what I expected but I don't really mind. These distros are for advanced users anyways.</p><p><a href="https://mastodon.social/tags/artix" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>artix</span></a> <a href="https://mastodon.social/tags/artixlinux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>artixlinux</span></a> <a href="https://mastodon.social/tags/linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>linux</span></a> <a href="https://mastodon.social/tags/runit" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>runit</span></a> <a href="https://mastodon.social/tags/foss" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>foss</span></a> <a href="https://mastodon.social/tags/freesoftware" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>freesoftware</span></a> <a href="https://mastodon.social/tags/opensource" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>opensource</span></a> <a href="https://mastodon.social/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a></p>
dorotaC<p>How much do <a href="https://fosstodon.org/tags/Python" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Python</span></a> clocks progress in "60 seconds"?</p><p>CLOCK_BOOTTIME 60.6<br>CLOCK_MONOTONIC 60.6<br>CLOCK_MONOTONIC_RAW 56.0<br>CLOCK_PROCESS_CPUTIME_ID 0.000952<br>CLOCK_REALTIME 60.6<br>CLOCK_TAI 60.6<br>CLOCK_THREAD_CPUTIME_ID 0.000952</p><p>Only CLOCK_MONOTONIC_RAW is tracking the hardware <a href="https://fosstodon.org/tags/clock" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>clock</span></a> correctly.</p><p>So if you actually want to measure <a href="https://fosstodon.org/tags/time" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>time</span></a> accurately, use that one.</p><p><a href="https://fosstodon.org/tags/linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>linux</span></a> <a href="https://fosstodon.org/tags/monotonic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>monotonic</span></a> <a href="https://fosstodon.org/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a> <a href="https://fosstodon.org/tags/rtc" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rtc</span></a></p>
dorotaC<p>I pressed the <a href="https://fosstodon.org/tags/turbo" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>turbo</span></a> button on my laptop.</p><p>(edited for clarity)</p><p>$ sudo hwclock &amp;&amp; date &amp;&amp; sleep 60 &amp;&amp; sudo hwclock &amp;&amp; date</p><p>22:50:48.433491+01:00<br>02:29:53 CET 2025</p><p>22:51:44.397740+01:00<br>02:30:54 CET 2025</p><p>It can now finish a minue in 56 seconds!</p><p><a href="https://fosstodon.org/tags/time" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>time</span></a> <a href="https://fosstodon.org/tags/linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>linux</span></a> <a href="https://fosstodon.org/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a></p>
Raj 🇬🇧🇪🇺💻🖥️ (🌻🇺🇦)<p>Was scratching my head for days why my core NTP server, which is also the internally authoritative DNS provider, couldn't resolve hostnames from its ntp.conf on startup, only literal IP addresses.</p><p>Not actually listing it in its own resolver configuration, might just possibly have been at the root of it.</p><p>D'oh!</p><p><a href="https://mastodon.me.uk/tags/linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>linux</span></a> <a href="https://mastodon.me.uk/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a> <a href="https://mastodon.me.uk/tags/dns" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>dns</span></a> <a href="https://mastodon.me.uk/tags/admin101" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>admin101</span></a></p>
ꙮ liilliil 🇫🇯🇱🇨🇱🇧<p>Поднял локальный <a href="https://mastodon.online/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a>, ибо гайверовская гирлянда виснет, сука, если не может до внешнего достучаться.<br>Теперь сердце всея интранета бьётся синхронно, плюс можно чуть ли не каждую минуту синкать</p>
katzenjens<p>Erfolg! Da es bei mir eh nicht mehr richtig tickt, kommt die schleichende Sekunde richtig gut. 🤪 Nun den Sketch noch optimieren und aufhübschen, dann kommt er in mein Blog. <a href="https://social.tchncs.de/tags/ESP32" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ESP32</span></a> <a href="https://social.tchncs.de/tags/arduino" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>arduino</span></a> <a href="https://social.tchncs.de/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a> <a href="https://social.tchncs.de/tags/basteln" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>basteln</span></a></p>
IT News<p>LED Wall Clock Gets Raspberry Pi Pico Upgrade - When [Rodrigo Feliciano] realized that the reason his seven-segment LED wall clock... - <a href="https://hackaday.com/2025/01/01/led-wall-clock-gets-raspberry-pi-pico-upgrade/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">hackaday.com/2025/01/01/led-wa</span><span class="invisible">ll-clock-gets-raspberry-pi-pico-upgrade/</span></a> <a href="https://schleuss.online/tags/microcontrollers" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>microcontrollers</span></a> <a href="https://schleuss.online/tags/sevensegmentled" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sevensegmentled</span></a> <a href="https://schleuss.online/tags/clockhacks" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>clockhacks</span></a> <a href="https://schleuss.online/tags/pipicow" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>pipicow</span></a> <a href="https://schleuss.online/tags/kicad" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>kicad</span></a> <a href="https://schleuss.online/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a></p>
jhx<p>Small little video about setting up <a href="https://fosstodon.org/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a> on <a href="https://fosstodon.org/tags/OPNSense" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OPNSense</span></a> 🔥 while also leveraging <a href="https://fosstodon.org/tags/systemd" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>systemd</span></a> (timesyncd) to keep track of time. 😎 </p><p>Enjoy everyone 👍 </p><p><a href="https://fosstodon.org/tags/Youtube" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Youtube</span></a> <br><a href="https://www.youtube.com/watch?v=f6tBKsqKnNo" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">youtube.com/watch?v=f6tBKsqKnN</span><span class="invisible">o</span></a></p><p><a href="https://fosstodon.org/tags/Odysee" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Odysee</span></a> <br><a href="https://odysee.com/@YetanotherSysAdmin:0/Setting-up-NTP-on-OPNSense:a" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">odysee.com/@YetanotherSysAdmin</span><span class="invisible">:0/Setting-up-NTP-on-OPNSense:a</span></a></p>
Santiago<p>Bueno, estuve trabajando un poco en la página del servidor NTP, ahora aparece una gráfica del GPS fix con la señal ruido, los satélites utilizados y un java applet que muestra el tiempo universal y local en el navegador. Todo un departamento de Metrología che <a href="https://undernet.uy/ntp/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">undernet.uy/ntp/</span><span class="invisible"></span></a> <a href="https://mastodon.uy/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a> <a href="https://mastodon.uy/tags/stratum1" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>stratum1</span></a> <a href="https://mastodon.uy/tags/undernet" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>undernet</span></a> <a href="https://mastodon.uy/tags/metrolog%C3%ADa" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>metrología</span></a> <a href="https://mastodon.uy/tags/metrology" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>metrology</span></a> <a href="https://mastodon.uy/tags/time" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>time</span></a> <a href="https://mastodon.uy/tags/tiempo" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>tiempo</span></a> <a href="https://mastodon.uy/tags/tiempouniversal" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>tiempouniversal</span></a> <a href="https://mastodon.uy/tags/universaltime" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>universaltime</span></a> <a href="https://mastodon.uy/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://mastodon.uy/tags/uruguay" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>uruguay</span></a></p>
Dagblad Van het Noorden RSS<p>[13:15] Hoogeveen onderzoekt valse facturen pas na druk van accountant. ChristenUnie stelt kritische vragen: 'Waarom was die prikkel nodig?'</p><p> Pas na aandringen van accountant Deloitte heeft de gemeente Hoogeveen extern onderzoek laten doen naar de betaling van valse facturen aan wegenbouwer NTP. Waarom heeft de gemeente niet direct zelf actie ondernomen, wil de ChristenUnie weten.</p><p> <a href="https://www.dvhn.nl/drenthe/hoogeveen/Onderzoek-valse-facturen-Hoogeveen-pas-na-druk-accountant-29313082.html" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">dvhn.nl/drenthe/hoogeveen/Onde</span><span class="invisible">rzoek-valse-facturen-Hoogeveen-pas-na-druk-accountant-29313082.html</span></a><br> <br> <a href="https://mastodon.ozioso.online/tags/Deloitte" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Deloitte</span></a> <a href="https://mastodon.ozioso.online/tags/gemeenteHoogeveen" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>gemeenteHoogeveen</span></a> <a href="https://mastodon.ozioso.online/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a> <a href="https://mastodon.ozioso.online/tags/ChristenUnie" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ChristenUnie</span></a></p>
ティージェーグレェI submitted a Pull Request to update MacPorts' chrony to 4.6.1 here:<br><br><a href="https://github.com/macports/macports-ports/pull/27072" rel="nofollow noopener" target="_blank">https://github.com/macports/macports-ports/pull/27072</a><br><br>GitHub Continuous Integration checks are running.<br><br>It's up to someone else with commit access to merge it.<br><br><a href="https://snac.bsd.cafe?t=chrony" class="mention hashtag" rel="nofollow noopener" target="_blank">#chrony</a> <a href="https://snac.bsd.cafe?t=macports" class="mention hashtag" rel="nofollow noopener" target="_blank">#MacPorts</a> <a href="https://snac.bsd.cafe?t=ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#NTP</a> <a href="https://snac.bsd.cafe?t=networktimeprotocol" class="mention hashtag" rel="nofollow noopener" target="_blank">#NetworkTimeProtocol</a> <a href="https://snac.bsd.cafe?t=ntpd" class="mention hashtag" rel="nofollow noopener" target="_blank">#NTPD</a> <a href="https://snac.bsd.cafe?t=opensource" class="mention hashtag" rel="nofollow noopener" target="_blank">#OpenSource</a> <a href="https://snac.bsd.cafe?t=gpl" class="mention hashtag" rel="nofollow noopener" target="_blank">#GPL</a> <a href="https://snac.bsd.cafe?t=macos" class="mention hashtag" rel="nofollow noopener" target="_blank">#macOS</a><br>
jan Anja :CrabVerified:<p><a href="https://craba.cab/tags/%D0%AF%D0%BD%D0%B4%D0%B5%D0%BA%D1%81" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Яндекс</span></a> признался в том, что ошибка в прошивке Я.Станций положила почти все <a href="https://craba.cab/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a>-сервера в ру-зоне</p><p><a href="https://habr.com/ru/companies/yandex/articles/861538/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">habr.com/ru/companies/yandex/a</span><span class="invisible">rticles/861538/</span></a></p>