Ntp Frequency Error Ppm
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Ntpd Synchronizing With Time Server
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[ -c conffile ] [ -f driftfile ] [ -g ] [ -k keyfile ] [ -l logfile ] [ -N high ] [ -p pidfile ] [ -r broadcastdelay ] [ -s statsdir ] [ -t key ] [ -v variable ] [ -V variable ] [ ntp drift tolerance -x ] Description The ntpd program is an operating system daemon which sets and maintains the system
Ntp Drift File
time of day in synchronism with Internet standard time servers. It is a complete implementation of the Network Time Protocol (NTP) version 4, but also ntp drift too large retains compatibility with version 3, as defined by RFC-1305, and version 1 and 2, as defined by RFC-1059 and RFC-1119, respectively. ntpd does most computations in 64-bit floating point arithmetic and does relatively clumsy 64-bit fixed point operations only when necessary https://access.redhat.com/solutions/35640 to preserve the ultimate precision, about 232 picoseconds. While the ultimate precision, is not achievable with ordinary workstations and networks of today, it may be required with future gigahertz CPU clocks and gigabit LANs. How NTP Operates The ntpd program operates by exchanging messages with one or more configured servers at designated poll intervals. When started, whether for the first or subsequent times, the program requires several exahanges from the majority of these servers so the signal processing and mitigation algorithms can accumulate http://doc.ntp.org/4.1.0/ntpd.htm and groom the data and set the clock. In order to protect the network from bursts, the initial poll interval for each server is delayed an interval randomized over 0-16s. At the default initial poll interval of 64s, several minutes can elapse before the clock is set. The initial delay to set the clock can be reduced using the iburst keyword with the server configuration command, as described on the Configuration Options page. Most operating systems and hardware of today incorporate a time-of-year (TOY) chip to maintain the time during periods when the power is off. When the machine is booted, the chip is used to initialize the operating system time. After the machine has synchronized to a NTP server, the operating system corrects the chip from time to time. In case there is no TOY chip or for some reason its time is more than 1000s from the server time, ntpd assumes something must be terribly wrong and the only reliable action is for the operator to intervene and set the clock by hand. This causes ntpd to exit with a panic message to the system log. The -g option overrides this check and the clock will be set to the server time regardless of the chip time. However, and to protect against broken hardware, such as when the CMOS battery fails or the clock counter becomes defective, once the clock has been set, an error greater than 1000s will cause ntpd to exit anyway. Under o
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regularly General support questions including new installations Post Reply Print view Search Advanced search 5 posts • Page 1 of 1 tmyoungjr Posts: 2 Joined: 2010/03/19 16:21:18 Location: Rochester, NY Clock Changes time regularly Quote Postby tmyoungjr » 2010/03/19 16:30:49 I have noticed my system time changes very often. Usually it's only by a minute or two.If i'm watching date I see things like this : $ dateFri Mar 19 12:26:59 EDT 2010$ dateFri Mar 19 12:25:23 EDT 2010$ dateFri Mar 19 12:25:23 EDT 2010$ dateFri Mar 19 12:27:00 EDT 2010$ dateFri Mar 19 12:25:23 EDT 2010I am running ntpd and sync'ing up to a few of the pool.ntp.org poolsCode: Select all$ sudo ntpq -p
Password:
remote refid st t when poll reach delay offset jitter
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+nonce.prolixium 209.51.161.238 2 u - 64 377 52.968 -149102 11.478
+bindcat.fhsu.ed 132.163.4.102 2 u - 64 377 84.190 -149126 36.746
*mirror 204.9.54.119 2 u - 64 377 44.069 -149129 25.113
LOCAL(0) .LOCL. 10 l 37 64 377 0.000 0.000 0.001
[Moderator edit: Insert code tags to preserve formatting]This is Cent 5 with kernel : 2.6.18-164.11.1.el5PAE my log/messages shows : Mar 19 12:16:52 alpha ntpd[4682]: kernel time sync status 0040Mar 19 12:16:54 alpha ntpd[4682]: frequency initialized -18.382 PPM from /var/lib/ntp/driftMar 19 12:21:45 alpha ntpd[4682]: synchronized to LOCAL(0), stratum 10Mar 19 12:22:49 alpha ntpd[4682]: synchronized to 208.53.158.34, stratum 2Mar 19 12:27:05 alpha ntpd[4682]: frequency error -587 PPM exceeds tolerance 500 PPMMar 19 12:28:11 alpha ntpd[4682]: frequency error -1069 PPM exceeds tolerance 500 PPMNow those errors aren't consistent but they do show on occasion. I'm thinking my hardware clock is giving me issues and causing