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<h3>
Eric S. Raymond 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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<strong><a href="https://gitlab.com/NTPsec/ntpsec/commit/d00da5661208e1f647e4bbf2524f0cfb96c56c09">d00da566</a></strong>
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<span>by Eric S. Raymond</span>
<i>at 2016-09-25T06:01:33-04:00</i>
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<pre class="commit-message" style="margin: 0; white-space: pre-wrap">Explain some assumptions.
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<h4>3 changed files:</h4>
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devel/tour.txt
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include/recvbuff.h
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ntpd/ntp_io.c
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<h4>Changes:</h4>
<li id="diff-0">
<a href="https://gitlab.com/NTPsec/ntpsec/commit/d00da5661208e1f647e4bbf2524f0cfb96c56c09#diff-0"><strong>devel/tour.txt</strong></a>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -140,6 +140,28 @@ and pool hostnames. This is intended to avoid adding startup delay</td>
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<pre style="margin: 0"> <span id="LC140" class="line">and jitter to the time synchronization logic due to address lookups</span>
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<pre style="margin: 0"> <span id="LC141" class="line">of unpredictable length.</span>
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<pre style="margin: 0"> <span id="LC142" class="line"></span>
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<pre style="margin: 0"> <span id="LC143" class="line">Input handling used to be a lot more complex. Due to inability to get</span>
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<pre style="margin: 0"> <span id="LC144" class="line">arrival timestamps from the host's UDP layer, the code used to do</span>
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<pre style="margin: 0"> <span id="LC145" class="line">asynchronous I/O with packet I/O indicated by signal, with packets</span>
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<pre style="margin: 0"> <span id="LC146" class="line">(and their arrival timestamps) being stashed in a ring of buffers that</span>
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<pre style="margin: 0"> <span id="LC147" class="line">was consumed by the protocol main loop.</span>
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<pre style="margin: 0"> <span id="LC148" class="line"></span>
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<pre style="margin: 0"> <span id="LC149" class="line">This looked partly like a performance hack, but if so it was an</span>
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<pre style="margin: 0"> <span id="LC150" class="line">ineffective one. Because there is necessarily a synchronous bottleneck</span>
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<pre style="margin: 0"> <span id="LC151" class="line">at protocol handling, packets arriving faster than the main loop could</span>
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<pre style="margin: 0"> <span id="LC152" class="line">cycle would pile up in the ring buffer and latecomers would be</span>
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<pre style="margin: 0"> <span id="LC153" class="line">dropped.</span>
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<pre style="margin: 0"> <span id="LC154" class="line"></span>
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<pre style="margin: 0"> <span id="LC155" class="line">The new organization stops pretending; it simply spins on a select</span>
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<pre style="margin: 0"> <span id="LC156" class="line">across all interfaces. If inbound traffic is more than the daemon</span>
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<pre style="margin: 0"> <span id="LC157" class="line">can handle, packets will pile up in the UDP layer and be dropped at</span>
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<pre style="margin: 0"> <span id="LC158" class="line">that level. The main difference is that dropped packets are no</span>
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<pre style="margin: 0"> <span id="LC159" class="line">longer visible in the statistics the server can gather.</span>
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<pre style="margin: 0"> <span id="LC160" class="line"></span>
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<pre style="margin: 0"> <span id="LC161" class="line">There was internal evidence in the NTP Classic build machinery that</span>
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162
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<pre style="margin: 0"> <span id="LC162" class="line">asynchronous I/O on Unix machines probably hadn't actually worked for</span>
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163
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<pre style="margin: 0"> <span id="LC163" class="line">quite a while before NTPsec removed it.</span>
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164
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<pre style="margin: 0"> <span id="LC164" class="line"></span>
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143
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165
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<pre style="margin: 0"> <span id="LC165" class="line">=== Refclock management ===</span>
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144
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166
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<pre style="margin: 0"> <span id="LC166" class="line"></span>
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145
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167
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<pre style="margin: 0"> <span id="LC167" class="line">There is an illuminating comment in ntpd/ntp_refclock.c that begins</span>
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<a href="https://gitlab.com/NTPsec/ntpsec/commit/d00da5661208e1f647e4bbf2524f0cfb96c56c09#diff-1"><strong>include/recvbuff.h</strong></a>
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<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -14,9 +14,9 @@</td>
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14
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<pre style="margin: 0"> <span id="LC14" class="line"><span class="cp" style="color: #999; font-weight: bold">#define RECV_TOOMANY 40 </span><span class="cm" style="color: #998; font-style: italic">/* this is way too many buffers */</span></span>
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15
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<pre style="margin: 0"> <span id="LC15" class="line"></span>
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16
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<pre style="margin: 0"> <span id="LC16" class="line"><span class="cm" style="color: #998; font-style: italic">/*</span></span>
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17
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<pre style="margin: 0"> <span id="LC17" class="line"><span class="cm" style="color: #998; font-style: italic"> * Format of a recvbuf. Back when <span class="idiff left right">this code</span> did true asynchronous</span></span>
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<pre style="margin: 0"> <span id="LC17" class="line"><span class="cm" style="color: #998; font-style: italic"> * Format of a recvbuf. Back when <span class="idiff left right">ntpd</span> did true asynchronous</span></span>
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18
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<pre style="margin: 0"> <span id="LC18" class="line"><span class="cm" style="color: #998; font-style: italic"> * I/O, these were used by the asynchronous receive routine to store</span></span>
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19
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<pre style="margin: 0"> <span id="LC19" class="line"><span class="cm" style="color: #998; font-style: italic"> * incoming packets and related information. Now, with faster processor</span></span>
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<pre style="margin: 0"> <span id="LC19" class="line"><span class="cm" style="color: #998; font-style: italic"> * incoming packets and related information. Now, with faster processor<span class="idiff left right">s</span></span></span>
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20
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<pre style="margin: 0"> <span id="LC20" class="line"><span class="cm" style="color: #998; font-style: italic"> * and lower latency in the synchronous I/O loop, that complexity</span></span>
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21
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<pre style="margin: 0"> <span id="LC21" class="line"><span class="cm" style="color: #998; font-style: italic"> * has been dropped.</span></span>
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22
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<pre style="margin: 0"> <span id="LC22" class="line"><span class="cm" style="color: #998; font-style: italic"> */</span></span>
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<a href="https://gitlab.com/NTPsec/ntpsec/commit/d00da5661208e1f647e4bbf2524f0cfb96c56c09#diff-2"><strong>ntpd/ntp_io.c</strong></a>
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<td class="diff-line-num unfold js-unfold new_line" data-linenumber="130" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -130,7 +130,9 @@ nic_rule *nic_rule_list;</td>
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<pre style="margin: 0"> <span id="LC130" class="line"><span class="cp" style="color: #999; font-weight: bold">#endif</span></span>
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131
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<pre style="margin: 0"> <span id="LC131" class="line"></span>
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132
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<pre style="margin: 0"> <span id="LC132" class="line"><span class="cm" style="color: #998; font-style: italic">/*</span></span>
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133
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<pre style="margin: 0"> <span id="LC133" class="line"><span class="cm" style="color: #998; font-style: italic"> * We do asynchronous input using the SIGIO facility. A number of</span></span>
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<td class="diff-line-num new old_line" data-linenumber="134" style="background: #ddfbe6; border-right-color: #c7f0d2; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#ddfbe6">
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<td class="diff-line-num new new_line" data-linenumber="133" style="background: #ddfbe6; border-right-color: #c7f0d2; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#ddfbe6">
133
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<pre style="margin: 0"> <span id="LC133" class="line"><span class="cm" style="color: #998; font-style: italic"> * This code is a remnant from when ntpd did asynchronous input using</span></span>
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<td class="diff-line-num new old_line" data-linenumber="134" style="background: #ddfbe6; border-right-color: #c7f0d2; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#ddfbe6">
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134
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<pre style="margin: 0"> <span id="LC134" class="line"><span class="cm" style="color: #998; font-style: italic"> * the SIGIO facility. Most of that complexity is gone now.</span></span>
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135
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<pre style="margin: 0"> <span id="LC135" class="line"><span class="cm" style="color: #998; font-style: italic"> *</span></span>
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134
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136
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<pre style="margin: 0"> <span id="LC136" class="line"><span class="cm" style="color: #998; font-style: italic"> * recvbuf buffers are preallocated for input. In the signal</span></span>
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135
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137
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<pre style="margin: 0"> <span id="LC137" class="line"><span class="cm" style="color: #998; font-style: italic"> * handler we poll to see which sockets are ready and read the</span></span>
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136
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138
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<pre style="margin: 0"> <span id="LC138" class="line"><span class="cm" style="color: #998; font-style: italic"> * packets from them into the recvbuf's along with a time stamp and</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="3458" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">...</td>
<td class="diff-line-num unfold js-unfold new_line" data-linenumber="3460" style="background: #fafafa; border-right-color: #f0f0f0; border-right-style: solid; border-right-width: 1px; color: rgba(0,0,0,0.3); padding: 0 5px; text-align: right; width: 35px" align="right" bgcolor="#fafafa">...</td>
<td class="line_content match " style="background: #fafafa; color: rgba(0,0,0,0.3); padding-left: 0.5em; padding-right: 0.5em" bgcolor="#fafafa">@@ -3458,7 +3460,7 @@ io_handler(void)</td>
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3458
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3460
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<pre style="margin: 0"> <span id="LC3460" class="line"><span class="p">}</span></span>
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3459
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3461
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<pre style="margin: 0"> <span id="LC3461" class="line"></span>
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3460
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3462
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<pre style="margin: 0"> <span id="LC3462" class="line"><span class="cm" style="color: #998; font-style: italic">/*</span></span>
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3461
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<pre style="margin: 0"> <span id="LC3461" class="line"><span class="cm" style="color: #998; font-style: italic"> * input_handler - receive packets<span class="idiff left right"> asynchronously</span></span></span>
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3463
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<pre style="margin: 0"> <span id="LC3463" class="line"><span class="cm" style="color: #998; font-style: italic"> * input_handler - receive packets</span></span>
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3462
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3464
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<pre style="margin: 0"> <span id="LC3464" class="line"><span class="cm" style="color: #998; font-style: italic"> */</span></span>
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3463
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3465
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<pre style="margin: 0"> <span id="LC3465" class="line"><span class="k" style="font-weight: bold">static</span> <span class="kt" style="color: #458; font-weight: bold">void</span></span>
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3464
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3466
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<pre style="margin: 0"> <span id="LC3466" class="line"><span class="nf" style="color: #900; font-weight: bold">input_handler</span><span class="p">(</span></span>
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