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<h3>
Richard Laager pushed to branch master
at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>
</h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/-/commit/58bcc02dc8f797c3213ea04cbce57811bef364db">58bcc02d</a></strong>
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<span>by Richard Laager</span>
<i>at 2020-10-26T04:46:02+00:00</i>
</div>
<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Update the SHM gpsd documentation
This makes a few changes:
- It merges the two mentions of gpsd (in the SHM docs) into one
section.
- It removes the talk about ntpd combining serial and PPS data. gpsd
already joins these data streams.
- It no longer describes SHM as "the ancient way to have GPSD talk to
ntpd".
- The old note about "minpoll 4" is removed. It has been replaced by
portions of text from gpsd-time-service-howto.adoc.
Fixes #668
</pre>
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<h4>1 changed file:</h4>
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<a href="#3b227c0edbae28f25f9c1aff3d2cabd272cd623f">
docs/driver_shm.adoc
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<h4>Changes:</h4>
<li id="3b227c0edbae28f25f9c1aff3d2cabd272cd623f">
<a href="https://gitlab.com/NTPsec/ntpsec/-/commit/58bcc02dc8f797c3213ea04cbce57811bef364db#3b227c0edbae28f25f9c1aff3d2cabd272cd623f"><strong>docs/driver_shm.adoc</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -80,26 +80,6 @@ data.</td>
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<pre style="margin: 0;"> <span id="LC80" class="line" lang="plaintext">limit (either _time2_ or the default of 4 h), then the sample is</span>
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<pre style="margin: 0;"> <span id="LC81" class="line" lang="plaintext">discarded. This check is disabled when _flag1_ is set to 1.</span>
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<pre style="margin: 0;"> <span id="LC82" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC83" class="line" lang="plaintext">== GPSD</span>
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<pre style="margin: 0;">-<span id="LC84" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC85" class="line" lang="plaintext">https://gpsd.io/[_GPSD_] knows how to talk to many GPS devices.</span>
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<pre style="margin: 0;">-<span id="LC86" class="line" lang="plaintext">It can work with _ntpd_ through the SHM driver.</span>
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<pre style="margin: 0;">-<span id="LC87" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC88" class="line" lang="plaintext">The _GPSD_ man page suggests setting minpoll and maxpoll to 4. That was</span>
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<pre style="margin: 0;">-<span id="LC89" class="line" lang="plaintext">an attempt to reduce jitter. The SHM driver was fixed (ntp-4.2.5p138) to</span>
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<pre style="margin: 0;">-<span id="LC90" class="line" lang="plaintext">collect data each second rather than once per polling interval so that</span>
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<pre style="margin: 0;">-<span id="LC91" class="line" lang="plaintext">suggestion is no longer reasonable.</span>
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<pre style="margin: 0;">-<span id="LC92" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC93" class="line" lang="plaintext">*Note:* The _GPSD_ client driver uses the _GPSD_ client</span>
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<pre style="margin: 0;">-<span id="LC94" class="line" lang="plaintext">protocol to connect and talk to _GPSD_, but using the SHM driver is the</span>
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<pre style="margin: 0;">-<span id="LC95" class="line" lang="plaintext">ancient way to have _GPSD_ talk to _ntpd_. There are some tricky points</span>
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<pre style="margin: 0;">-<span id="LC96" class="line" lang="plaintext">when using the SHM interface to interface with _GPSD_, because _GPSD_</span>
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<pre style="margin: 0;">-<span id="LC97" class="line" lang="plaintext">will use two SHM clocks, one for the serial data stream and one for the</span>
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<pre style="margin: 0;">-<span id="LC98" class="line" lang="plaintext">PPS information when available. Receivers with a loose/sloppy timing</span>
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<pre style="margin: 0;">-<span id="LC99" class="line" lang="plaintext">between PPS and serial data can easily cause trouble here because _ntpd_</span>
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<pre style="margin: 0;">-<span id="LC100" class="line" lang="plaintext">has no way to join the two data streams and correlate the serial data</span>
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<pre style="margin: 0;">-<span id="LC101" class="line" lang="plaintext">with the PPS events.</span>
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<pre style="margin: 0;">-<span id="LC102" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC83" class="line" lang="plaintext">== Clockstats</span>
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84
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<pre style="margin: 0;"> <span id="LC84" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC85" class="line" lang="plaintext">If flag4 is set when the driver is polled, a clockstats record is</span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -193,15 +173,35 @@ for the specific unit.</td>
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<pre style="margin: 0;"> <span id="LC173" class="line" lang="plaintext">+baud+ 'number'::</span>
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<pre style="margin: 0;"> <span id="LC174" class="line" lang="plaintext"> Not used by this driver.</span>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC196" class="line" lang="plaintext">== Configuration Example</span>
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<pre style="margin: 0;">+<span id="LC176" class="line" lang="plaintext">== GPSD Configuration Example</span>
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<pre style="margin: 0;">+<span id="LC177" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC178" class="line" lang="plaintext">The most common use of this driver is to get samples from a</span>
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<pre style="margin: 0;">+<span id="LC179" class="line" lang="plaintext">https://gpsd.io/[_gpsd_] instance. _GPSD_ knows how to talk to many GPS</span>
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<pre style="margin: 0;">+<span id="LC180" class="line" lang="plaintext">devices. _GPSD_ will provide one or more SHM clocks depending on its</span>
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<pre style="margin: 0;">+<span id="LC181" class="line" lang="plaintext">configuration.</span>
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<pre style="margin: 0;"> <span id="LC182" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC198" class="line" lang="plaintext">The most common use of this driver is to get samples from a gpsd instance:</span>
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<pre style="margin: 0;">+<span id="LC183" class="line" lang="plaintext">For a GPS receiver with a pulse-per-second (PPS) connected to the host, there</span>
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<pre style="margin: 0;">+<span id="LC184" class="line" lang="plaintext">will be one SHM clock for the serial data stream only and another SHM clock</span>
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<pre style="margin: 0;">+<span id="LC185" class="line" lang="plaintext">with the PPS timing (when available):</span>
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<pre style="margin: 0;"> <span id="LC186" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="plaintext">----------------------------------------------------------------------------</span>
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="plaintext">refclock shm unit 0 refid GPS</span>
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="plaintext">refclock shm unit 1 prefer refid PPS</span>
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<pre style="margin: 0;"> <span id="LC190" class="line" lang="plaintext">----------------------------------------------------------------------------</span>
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC192" class="line" lang="plaintext">Note that there may be additional SHM clocks. For example, the PPS might be</span>
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<pre style="margin: 0;">+<span id="LC193" class="line" lang="plaintext">on +unit 2+.</span>
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194
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<pre style="margin: 0;">+<span id="LC194" class="line" lang="plaintext"></span>
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195
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<pre style="margin: 0;">+<span id="LC195" class="line" lang="plaintext">The ntpd default minpoll is 6, and can be set as low as 0. Changing</span>
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196
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<pre style="margin: 0;">+<span id="LC196" class="line" lang="plaintext">minpoll to 3, 2, 1 or maybe even as low as 0, may reduce your PPS jitter</span>
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197
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<pre style="margin: 0;">+<span id="LC197" class="line" lang="plaintext">by over a factor of 4.</span>
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198
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<pre style="margin: 0;">+<span id="LC198" class="line" lang="plaintext"></span>
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199
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<pre style="margin: 0;">+<span id="LC199" class="line" lang="plaintext">Any change will require several hours for ntpd to converge with the new</span>
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200
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<pre style="margin: 0;">+<span id="LC200" class="line" lang="plaintext">settings. Use ntpviz to find the best poll interval for your system.</span>
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201
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<pre style="margin: 0;">+<span id="LC201" class="line" lang="plaintext"></span>
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202
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<pre style="margin: 0;">+<span id="LC202" class="line" lang="plaintext">The value that yields the lowest jitter may not be the one that yields</span>
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203
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<pre style="margin: 0;">+<span id="LC203" class="line" lang="plaintext">the best offset.</span>
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204
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<pre style="margin: 0;">+<span id="LC204" class="line" lang="plaintext"></span>
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205
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205
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<pre style="margin: 0;"> <span id="LC205" class="line" lang="plaintext">== Public vs. Private SHM segments</span>
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206
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206
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<pre style="margin: 0;"> <span id="LC206" class="line" lang="plaintext"></span>
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207
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207
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<pre style="margin: 0;"> <span id="LC207" class="line" lang="plaintext">The driver attempts to create a shared memory segment with an</span>
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