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<h3>
Hal Murray pushed to branch master
at <a href="https://gitlab.com/NTPsec/ntpsec">NTPsec / ntpsec</a>
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<h4>
Commits:
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<ul>
<li>
<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/6c669da93a7e8fb748d13ce96176d5a0eedf915c">6c669da9</a></strong>
<div>
<span>by Hal Murray</span>
<i>at 2018-01-02T05:01:22-08:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">Cleanup pass
Add comment about parser: int vs unsigned
Cleanup DNS area.
Other minor tweaks.
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<h4>1 changed file:</h4>
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<li class="file-stats">
<a href="#7bb1ded6cb62df2554422eb291b61743d3759964">
devel/tour.txt
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<h4>Changes:</h4>
<li id="7bb1ded6cb62df2554422eb291b61743d3759964">
<a href="https://gitlab.com/NTPsec/ntpsec/commit/6c669da93a7e8fb748d13ce96176d5a0eedf915c#7bb1ded6cb62df2554422eb291b61743d3759964"><strong>devel/tour.txt</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">@@ -136,7 +136,14 @@ control logic works with.</td>
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<pre style="margin: 0;"> <span id="LC136" class="line" lang="plaintext">The peer buffer holds the last 8 samples from the upstream source.</span>
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<pre style="margin: 0;"> <span id="LC137" class="line" lang="plaintext">The normal logic uses the one with the lowest round trip time. That's</span>
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<pre style="margin: 0;"> <span id="LC138" class="line" lang="plaintext">a hack to minimize errors from queuing delays out on the big bad</span>
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<pre style="margin: 0;">-<span id="LC139" class="line" lang="plaintext">internet. Refclock data always has a round trip time of 0.</span>
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<pre style="margin: 0;">+<span id="LC139" class="line" lang="plaintext">internet. Refclock data always has a round trip time of 0 and the</span>
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<pre style="margin: 0;">+<span id="LC140" class="line" lang="plaintext">code that finds the lowest RTT picks the most recent slot when the</span>
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<pre style="margin: 0;">+<span id="LC141" class="line" lang="plaintext">RTTs are equal.</span>
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<pre style="margin: 0;">+<span id="LC142" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC143" class="line" lang="plaintext">== config file parser ==</span>
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<pre style="margin: 0;">+<span id="LC144" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC145" class="line" lang="plaintext">There is a minor quirk: numbers come in as integers, type T_Integer.</span>
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<pre style="margin: 0;">+<span id="LC146" class="line" lang="plaintext">There is no type T_Unsigned. Range checking may not work right.</span>
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<pre style="margin: 0;"> <span id="LC147" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC148" class="line" lang="plaintext">== ntpd control flow ==</span>
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<pre style="margin: 0;"> <span id="LC149" class="line" lang="plaintext"></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="163" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="170" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -163,7 +170,8 @@ Input handling used to be a lot more complex. Due to inability to get</td>
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<pre style="margin: 0;"> <span id="LC170" class="line" lang="plaintext">arrival timestamps from the host's UDP layer, the code used to do</span>
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<pre style="margin: 0;"> <span id="LC171" class="line" lang="plaintext">asynchronous I/O with packet I/O indicated by signal, with packets</span>
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<pre style="margin: 0;"> <span id="LC172" class="line" lang="plaintext">(and their arrival timestamps) being stashed in a ring of buffers that</span>
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<pre style="margin: 0;">-<span id="LC166" class="line" lang="plaintext">was consumed by the protocol main loop.</span>
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<pre style="margin: 0;">+<span id="LC173" class="line" lang="plaintext">was consumed by the protocol main loop. Some of this code hasn't been</span>
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<pre style="margin: 0;">+<span id="LC174" class="line" lang="plaintext">cleaned up yet.</span>
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<pre style="margin: 0;"> <span id="LC175" class="line" lang="plaintext"></span>
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168
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176
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<pre style="margin: 0;"> <span id="LC176" class="line" lang="plaintext">This looked partly like a performance hack, but if so it was an</span>
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169
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177
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<pre style="margin: 0;"> <span id="LC177" class="line" lang="plaintext">ineffective one. Because there is necessarily a synchronous bottleneck</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">@@ -179,7 +187,7 @@ time. This used to be significant relative to users' accuracy</td>
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179
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187
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<pre style="margin: 0;"> <span id="LC187" class="line" lang="plaintext">expectations for NTP, but scheduler timeslices have since decreased</span>
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180
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188
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<pre style="margin: 0;"> <span id="LC188" class="line" lang="plaintext">by orders of magnitude and squashed the issue. We know this from some</span>
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181
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189
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<pre style="margin: 0;"> <span id="LC189" class="line" lang="plaintext">tests setup having run for six months with packet-timestamp fetching</span>
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182
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<pre style="margin: 0;">-<span id="LC182" class="line" lang="plaintext">accidentally disabled...)</span>
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190
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<pre style="margin: 0;">+<span id="LC190" class="line" lang="plaintext">accidentally disabled...<span class="idiff left right"> But they weren't horribly busy systems.</span>)</span>
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183
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191
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<pre style="margin: 0;"> <span id="LC191" class="line" lang="plaintext"></span>
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184
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192
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<pre style="margin: 0;"> <span id="LC192" class="line" lang="plaintext">The new organization stops pretending; it simply spins on a select</span>
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185
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193
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<pre style="margin: 0;"> <span id="LC193" class="line" lang="plaintext">across all interfaces. If inbound traffic is more than the daemon can</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">@@ -344,49 +352,36 @@ injects that into the peer buffer for the refclock.</td>
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344
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352
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<pre style="margin: 0;"> <span id="LC352" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC353" class="line" lang="plaintext">== Asynchronous DNS lookup ==</span>
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<pre style="margin: 0;"> <span id="LC354" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC347" class="line" lang="plaintext">The<span class="idiff left right">re are great many complications in the code that arise from want</span>ing</span>
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348
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<pre style="margin: 0;">-<span id="LC348" class="line" lang="plaintext">t<span class="idiff left right">o avoid stalling the main loop while it waits for a DNS lookup to</span></span>
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349
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<pre style="margin: 0;">-<span id="LC349" class="line" lang="plaintext"><span class="idiff left right">return. And DNS </span>lookups can take a *long* time. Hal Murray notes that</span>
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355
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<pre style="margin: 0;">+<span id="LC355" class="line" lang="plaintext">The<span class="idiff left right"> DNS code runs in a separate thread in order to avoid stall</span>ing</span>
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356
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<pre style="margin: 0;">+<span id="LC356" class="line" lang="plaintext">t<span class="idiff left right">he main loop while it waits for a DNS lookup to return. And DNS</span></span>
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<pre style="margin: 0;">+<span id="LC357" class="line" lang="plaintext">lookups can take a *long* time. Hal Murray notes that</span>
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350
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<pre style="margin: 0;"> <span id="LC358" class="line" lang="plaintext">he thinks he's seen 40 seconds on a failing case.</span>
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<pre style="margin: 0;"> <span id="LC359" class="line" lang="plaintext"></span>
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352
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<pre style="margin: 0;">-<span id="LC352" class="line" lang="plaintext">One reason for the complications is that the async-DNS support seems</span>
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353
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<pre style="margin: 0;">-<span id="LC353" class="line" lang="plaintext">somewhat overengineered. Whoever built it was thinking in terms of a</span>
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354
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<pre style="margin: 0;">-<span id="LC354" class="line" lang="plaintext">general async-worker facility and implemented things that this use</span>
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<pre style="margin: 0;">-<span id="LC355" class="line" lang="plaintext">of it probably doesn't need - notably an input-buffer pool.</span>
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<pre style="margin: 0;">-<span id="LC356" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC357" class="line" lang="plaintext">This code is a candidate to be replaced by an async-DNS library such</span>
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<pre style="margin: 0;">-<span id="LC358" class="line" lang="plaintext">as cAres. One attempt at this has been made, but abandoned because</span>
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<pre style="margin: 0;">-<span id="LC359" class="line" lang="plaintext">the async-worker interface to the rest of the code is pretty gnarly.</span>
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<pre style="margin: 0;">+<span id="LC360" class="line" lang="plaintext">The old async-DNS support seemed somewhat overengineered. Whoever</span>
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<pre style="margin: 0;">+<span id="LC361" class="line" lang="plaintext">built it was thinking in terms of a general async-worker facility</span>
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<pre style="margin: 0;">+<span id="LC362" class="line" lang="plaintext">and implemented things that this use of it probably doesn't</span>
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<pre style="margin: 0;">+<span id="LC363" class="line" lang="plaintext">need - notably an input-buffer pool. (It also had an obscure bug.)</span>
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<pre style="margin: 0;"> <span id="LC364" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC365" class="line" lang="plaintext">The DNS lookups during initialization - of hostnames specified on the</span>
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<pre style="margin: 0;">-<span id="LC362" class="line" lang="plaintext">command line of ntp.conf - could be done synchronously. But there are</span>
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<pre style="margin: 0;">-<span id="LC363" class="line" lang="plaintext">two cases we know of where ntpd has to do a DNS lookup after its</span>
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<pre style="margin: 0;">-<span id="LC364" class="line" lang="plaintext">main loop gets started.</span>
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<pre style="margin: 0;">+<span id="LC366" class="line" lang="plaintext">command line or server lines in ntp.conf - could be done synchronously.</span>
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<pre style="margin: 0;">+<span id="LC367" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC368" class="line" lang="plaintext">But that would delay startup and there are two cases we know of where</span>
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<pre style="margin: 0;">+<span id="LC369" class="line" lang="plaintext">ntpd has to do a DNS lookup during normal operation.</span>
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<pre style="margin: 0;"> <span id="LC370" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC371" class="line" lang="plaintext">One is the try again when DNS for the normal server case doesn't work during</span>
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<pre style="margin: 0;"> <span id="LC372" class="line" lang="plaintext">initialization. It will try again occasionally until it gets an answer.</span>
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<pre style="margin: 0;"> <span id="LC373" class="line" lang="plaintext">(which might be negative)</span>
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<pre style="margin: 0;"> <span id="LC374" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC370" class="line" lang="plaintext">The main one is the pool code trying for a new server. There are</span>
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<pre style="margin: 0;">-<span id="LC371" class="line" lang="plaintext">several possible extensions in this area. The main one would be to verify that</span>
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<pre style="margin: 0;">-<span id="LC372" class="line" lang="plaintext">a server you are using is still in the pool. (There isn't a way to do</span>
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<pre style="margin: 0;">-<span id="LC373" class="line" lang="plaintext">that yet - the pool doesn't have any DNS support for that.) The other</span>
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<pre style="margin: 0;">-<span id="LC374" class="line" lang="plaintext">would be to try replacing the poorest server rather than only</span>
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<pre style="margin: 0;">-<span id="LC375" class="line" lang="plaintext">replacing dead servers.</span>
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<pre style="margin: 0;">+<span id="LC375" class="line" lang="plaintext">The main one is the pool code trying for more servers. There are two</span>
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<pre style="margin: 0;">+<span id="LC376" class="line" lang="plaintext">cases for that. One is that the initial result didn't return as many</span>
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<pre style="margin: 0;">+<span id="LC377" class="line" lang="plaintext">addresses as desired. The other is when pool servers die and need to</span>
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<pre style="margin: 0;">+<span id="LC378" class="line" lang="plaintext">be replaced with working ones.</span>
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<pre style="margin: 0;"> <span id="LC379" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC377" class="line" lang="plaintext">As long as we get packet receive timestamps from the OS, synchronous</span>
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<pre style="margin: 0;">-<span id="LC378" class="line" lang="plaintext">DNS delays probably won't introduce any lies on the normal path. We</span>
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<pre style="margin: 0;">-<span id="LC379" class="line" lang="plaintext">could test that by putting a sleep in the main loop. (There is a</span>
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<pre style="margin: 0;">-<span id="LC380" class="line" lang="plaintext">filter to reject packets that take too long, but Hal thinks that's</span>
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<pre style="margin: 0;">-<span id="LC381" class="line" lang="plaintext">time-in-flight and excludes time sitting on the server.)</span>
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<pre style="margin: 0;">-<span id="LC382" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC383" class="line" lang="plaintext">There are two known cases where a pause in ntpd would cause troubles.</span>
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<pre style="margin: 0;">-<span id="LC384" class="line" lang="plaintext">One is that it would mess up refclocks. The other is that packets</span>
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385
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<pre style="margin: 0;">-<span id="LC385" class="line" lang="plaintext">will get dropped if too many of them arrive during the stall.</span>
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<pre style="margin: 0;">-<span id="LC386" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">-<span id="LC387" class="line" lang="plaintext">This probably means we could go synchronous-only and use the pool</span>
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388
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<pre style="margin: 0;">-<span id="LC388" class="line" lang="plaintext">command on a system without refclocks. That covers end nodes and</span>
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389
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<pre style="margin: 0;">-<span id="LC389" class="line" lang="plaintext">maybe lightly loaded servers.</span>
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<pre style="margin: 0;">+<span id="LC380" class="line" lang="plaintext">There are several possible extensions in this area. The main one would</span>
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<pre style="margin: 0;">+<span id="LC381" class="line" lang="plaintext">be to verify that a server you are using is still in the pool. (There</span>
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<pre style="margin: 0;">+<span id="LC382" class="line" lang="plaintext">isn't a way to do that yet - the pool doesn't have any DNS support</span>
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<pre style="margin: 0;">+<span id="LC383" class="line" lang="plaintext">for it.) The other would be to try replacing the poorest server</span>
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<pre style="margin: 0;">+<span id="LC384" class="line" lang="plaintext">rather than only replacing dead servers.</span>
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<pre style="margin: 0;"> <span id="LC385" class="line" lang="plaintext"></span>
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<pre style="margin: 0;"> <span id="LC386" class="line" lang="plaintext">== The build recipe ==</span>
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387
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<pre style="margin: 0;"> <span id="LC387" class="line" lang="plaintext"></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">@@ -504,9 +499,15 @@ ASCIIizations of MRU records, oldest to newest. The spans include</td>
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504
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499
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<pre style="margin: 0;"> <span id="LC499" class="line" lang="plaintext">sequence metadata intended to allow you to stitch them together on the</span>
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505
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500
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<pre style="margin: 0;"> <span id="LC500" class="line" lang="plaintext">fly in O(n) time.</span>
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506
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501
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<pre style="margin: 0;"> <span id="LC501" class="line" lang="plaintext"></span>
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507
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<pre style="margin: 0;">-<span id="LC507" class="line" lang="plaintext">There is also a direct mode that makes the individual spans available</span>
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508
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<pre style="margin: 0;">-<span id="LC508" class="line" lang="plaintext">as they come in. This may be useful for getting partial data from</span>
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509
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<pre style="margin: 0;">-<span id="LC509" class="line" lang="plaintext">very heavily-loaded servers.</span>
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502
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<pre style="margin: 0;">+<span id="LC502" class="line" lang="plaintext">Note that the data for a slot will be returned more than once if a</span>
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503
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<pre style="margin: 0;">+<span id="LC503" class="line" lang="plaintext">request arrives after the data was returned but before the collection</span>
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504
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<pre style="margin: 0;">+<span id="LC504" class="line" lang="plaintext">has finished.</span>
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505
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<pre style="margin: 0;">+<span id="LC505" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC506" class="line" lang="plaintext">The code collects all the data, maybe sorts it, then prints it out.</span>
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<pre style="margin: 0;">+<span id="LC507" class="line" lang="plaintext"></span>
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<pre style="margin: 0;">+<span id="LC508" class="line" lang="plaintext">There is also a direct mode that prints the individual slots</span>
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<pre style="margin: 0;">+<span id="LC509" class="line" lang="plaintext">as they come in. This avoids needing lots of memory if you want</span>
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510
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<pre style="margin: 0;">+<span id="LC510" class="line" lang="plaintext">to get the MRU data from a system that keeps lots of history.</span>
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511
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<pre style="margin: 0;"> <span id="LC511" class="line" lang="plaintext"></span>
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511
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512
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<pre style="margin: 0;"> <span id="LC512" class="line" lang="plaintext">A further interesting complication is use of a nonce to foil DDoSes by</span>
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512
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513
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<pre style="margin: 0;"> <span id="LC513" class="line" lang="plaintext">source-address spoofing. The mrulist() code begins by requesting a</span>
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