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184 <td><font size=2 color=#ffffff><b>Date</b></font></td>
186 <tr bgcolor=#CCCCE7><td><font size=2><b>19195</b></font></td>
187 <td bgcolor=#ffffff><font size=2> </font></td>
188 <td><font size=2><b>Upgraded to 2.6, using xntpd, but the system clock is drifting. Worked fine</b></font></td>
189 <td bgcolor=#ffffff><font size=2> </font></td>
190 <td><font size=2><b>4 Sep 1999</b></font></td>
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194 <td><font size=2 color=#ffffff><b><a name=Problem-Description>Problem Description</a></b></font></td>
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196 <pre>Ever since upgrading to Solaris 2.6, the system clock has been drifting and
197 there are messages like 'synchronisation lost', 'Previous time adjustment
198 didn''t complete' and 'time reset (step)' a lot in the /var/adm/messages
199 file. The system either was previously working fine with the freeware
200 xntpd or the configuration was copied from another system that was
201 using the freeware version.
202 -- 23-Apr-99 08:22 US/Eastern --</pre><table width=100% cellpadding=2 cellspacing=0 border=0><tr bgcolor=#999999>
203 <td><font size=2 color=#ffffff><b><a name=Problem-Solution>Problem Solution</a></b></font></td>
204 <td align=right><b><a href="#top"><font size=2 color=#ffffff>Top</font></a></b></td></tr></table>
205 <pre>The common lore for setting up xntpd on Solaris using
206 the freeware version included the warning to set the
207 kernel variable <font color=red>dosynctodr</font> to 0 in the /etc/system
208 file thus: set <font color=red>dosynctodr</font>=0
210 When using NTP on Solaris 2.6 or later, the kernel
211 variable MUST be left at the default value of 1. Prior
212 to 2.6 this variable controlled whether or not to rein
213 in the softclock using the hardware clock, with the result
214 that NTP and the hardware clock would fight for control of
215 the soft clock; thus before 2.6 you had to set <font color=red>dosynctodr</font>
216 to 0. At 2.6, every system call that adjusts the softclock
217 also sets the hard clock, thus while NTP controls the soft
218 clock, the hard clock is also controlled. Setting
219 <font color=red>dosynctodr</font> to 0 reverts the behavior back to the pre 2.6
220 defaulkt behavior, having exactly the opposite effect
223 Do not set <font color=red>dosynctodr</font> to 0.</pre><table width=100% cellpadding=2 cellspacing=0 border=0>
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225 <td bgcolor=#cccccc valign=top width=75%><font size=2>Bundled Network</font></td></tr>
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227 <td bgcolor=#cccccc valign=top width=75%><font size=2>NTP</font></td></tr>
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229 <td bgcolor=#cccccc valign=top width=75%><font size=2>Solaris 2.6</font></td></tr>
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231 <td bgcolor=#cccccc valign=top width=75%><font size=2>Ultra 2</font></td></tr>
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233 <td bgcolor=#cccccc valign=top width=75%><font size=2>with freeware xntpd.</font></td></tr>
235 <font size=2><a href="#top">Top</a></font><br><br>
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