diff options
Diffstat (limited to 'html/hints/solaris.html')
| -rw-r--r-- | html/hints/solaris.html | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/html/hints/solaris.html b/html/hints/solaris.html new file mode 100644 index 000000000000..7161d5dd3b39 --- /dev/null +++ b/html/hints/solaris.html @@ -0,0 +1,144 @@ +<HTML> +<HEAD> +<TITLE>Solaris hints and kinks</title><link href="scripts/style.css" type="text/css" rel="stylesheet"> + +</HEAD> +<BODY> +Information on compiling and executing ntpd under Solaris. +<BR> +Last Updated: Sun Jun 21 01:32:18 EDT 1998, +John Hawkinson, +<! -- This is deliberately not a mailto -- > <jhawk@MIT.EDU> +<P> +If you're not running Solaris 2.5.1 or later, it is likely +that you will have problems; upgrading would be a really good plan. +<P> +<H3>All Solaris versions</H3> +<P> + We have a report that says starting with Solaris 2.6 we should leave + <I>dosynctodr</I> alone. + <A HREF="solaris-dosynctodr.html">Here is the report</A>. +<P> +Proper operation of ntp under Solaris may require setting the kernel +variable <I>dosynctodr</I> to zero (meaning "do not synchronize the clock +to the hardware time-of-day clock"). This can be done with the +tickadj utility: +<BLOCKQUOTE><TT> +tickadj -s +</TT></BLOCKQUOTE> +If you prefer, it can also be done with the native Solaris kernel debugger: +<BLOCKQUOTE><TT> +echo dosynctodr/W0 | adb -k -w /dev/ksyms /dev/mem +</BLOCKQUOTE></TT> +<P> +Or, it can also be set by adding a line to /etc/system: +<BLOCKQUOTE><TT> +set dosynctodr = 0 +</BLOCKQUOTE></TT> +<P> +Instead of the <I>tick</I> kernel variable, which many operating +systems use to control microseconds added to the system time every +clock tick (c.f. <A HREF="../notes.html#frequency_tolerance">Dealing +with Frequency Tolerance Violations</A>), Solaris has the variables +<I>nsec_per_tick</I> and <I>usec_per_tick</I>. +<P> +<I>nsec_per_tick</I> and <I>usec_per_tick</I> control the number of +nanoseconds and microseconds, respectively, added to the system clock +each clock interrupt. Enterprising souls may set these based on +information collected by ntpd in the <CODE>/etc/ntp.drift</CODE> file +to correct for individual hardware variations. +<P> +On UltraSPARC systems, <I>nsec_per_tick</I> and <I>usec_per_tick</I> +are ignored in favor of the <I>cpu_tick_freq</I> variable, which +should be automatically be determined by the PROM in an accurate +fashion. +<P> +In general, the same ntp binaries should not be used across multiple +operating system releases. There is enough variation in the core operating +system support for timekeeping that a rebuild of ntpd for the idiosyncracies +of your specific operating system version is advisable. +<P> +It is recommended that ntp be started via a script like <A +HREF="solaris.xtra.S99ntpd">this one</A>, installed in +<CODE>/etc/init.d/ntpd</CODE> with a symbol link from +<CODE>/etc/rc2.d/S99ntpd</CODE>. + +<H3>Solaris 2.6</H3> +<P> +Solaris 2.6 adds support for kernel PLL timekeeping, but breaks this +support in such a fashion that using it worse than not. This is <A +HREF="solaris.xtra.4095849"> SUN Bug ID 4095849</A>, and it is not yet +fixed as of June 1998. +<P> +<H3>Solaris 2.5 and 2.5.1</H3> +<P> +On UltraSPARC systems, calculation of <I>cpu_tick_freq</I> is broken +such that values that are off by significant amounts may be used +instead. This unfortunately means that ntpd may have severe problems +keeping synchronization. This is <A HREF="solaris.xtra.4023118"> SUN Bug ID +4023118</A>. Bryan Cantrill <! -- <bmc@eng.sun.com> --> of Sun +posted <A HREF="solaris.xtra.patchfreq">patchfreq</A>, a workaround script, +to comp.protocols.time.ntp in March of 1997. +<P> +<HR> +<H2>OLD DATA</H2> +<STRONG>I can't vouch for the accuracy the information below this +rule. It may be significantly dated or incorrect.</STRONG> +<P> +<P> +<H3>Solaris 2.2</H3> +<P> +Solaris 2.2 and later contain completely re-written clock code to +provide high resolution microsecond timers. A benefit of the +re-written clock code is that adjtime does not round off its +adjustments, so ntp does not have to compensate for this +rounding. Under Solaris 2.2 and later, ntp #define's +<CODE>ADJTIME_IS_ACCURATE</CODE>, and does not look for the <I>tickadj</I> +kernel variable. +<P> +<H3>Solaris 2.1</H3> +(This originally written by William L. Jones <jones@chpc.utexas.edu>) +<P> +Solaris 2.1 contains fairly traditional clock code, with <I>tick</I> +and <I>tickadj</I>. +<P> +Since settimeofday under Solaris 2.1 only sets the seconds part of timeval +care must be used in starting xntpd. I suggest the following start +up script: +<BLOCKQUOTE><TT> +tickadj -s -a 1000 +<BR>ntpdate -v server1 server2 +<BR>sleep 20 +<BR>ntpdate -v server1 server2 +<BR>sleep 20 +<BR>tickadj -a 200 +<BR>xntpd +</TT></BLOCKQUOTE> + +The first tickadj turns of the time of day clock and sets the tick +adjust value to 1 millisecond. This will insure that an adjtime value +of at most 2 seconds will complete in 20 seconds. +<P> +The first ntpdate will set the time to within two seconds +using settimeofday or it will adjust time using adjtime. +<P> +The first sleep insures the adjtime has completed for the first ntpdate. +<P> +The second ntpdate will use adjtime to set the time of day since the +clock should be within 2 seconds of the correct time. +<P> +The second tickadj set the tick adjust system value to 5 microseconds. +<P> +The second sleeps insure that adjtime will complete before starting +the next xntpd. +<P> +I tried running with a tickadj of 5 microseconds with out much success. +200 microseconds seems to work well. +<P> +<HR> +Prior versions of this file had major text contributed by: +<MENU> +<LI>Denny Gentry <denny@eng.sun.com> +</MENU> +<BODY> +</HTML> |