[ntp:questions] Taming statistics files (was: Re: ntp documentation)
Richard B. Gilbert wrote: [] filegen creates a new file daily or weekly or monthly. . . . These files can eat many megabytes of disk space if you let them. If you're not prepared to analyze and summarize all the data, do yourself a favor and skip creating the files. The tools to do so are included in the ntpd distribution but you do have to find them, and use them and then clean up the obsolete files. . . . I wrote a small utility I have found very handy on my systems: http://www.david-taylor.myby.co.uk/software/disk.html#TrimTree It allows you to delete files matching a wildcard mask which are more than a certain number of days old, so you could, for example, keep just a week's worth of loopstats by running a nightly command: trimtree 7 C:\Tools\NTP\etc\ loopstats.2* It's helped a few other folk as well. Cheers, David ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] ntp documentation
Unruh wrote: Dennis Hilberg, Jr. [EMAIL PROTECTED] writes: [] The official NTP docs are in html format only. And impossible to wade through. Could you tell me where the statistics and the peerstats directives are actually discussed? Trying to look at those docs gives me no hint. Ie, what is needed is like in the man page-- a list of the config variables and options with a brief description. Try using a search engine, e.g. Google with: site:www.eecis.udel.edu peerstats I agree that it's not always easy to find things in the HTML, but that's a function of the content, not the document format. Section 8.1.2 discusses peerstats and loopstats: http://www.eecis.udel.edu/~ntp/ntpfaq/NTP-s-trouble.htm BTW: none of the systems I use support man pages - but they can all read HTML documents, so please don't take the HTML away! Cheers, David ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] ntp documentation
Unruh wrote: Richard B. Gilbert [EMAIL PROTECTED] writes: Unruh wrote: Where is there ntp documentation? For example I wanted to have ntp write out the statistics on its peers etc. I looked everywhere-- man page of ntp, ntp.conf, etc, and finally discovered by looking at the source that there seem to be a huge bunch of undocumented options. Or are they documented somewhere in that filing cabinette down some broken steps in a flooded basement, behind a door labeled Beware of Tigers You'll find the secret staircase at ntp.org. The humidity may be a little high in the basement but it's not actually wet. ;-) This snippet from my ntp.conf might help: logfile /var/ntp/ntp.log statsdir /var/ntp/ntpstats/ statistics peerstats clockstats filegen peerstats file peerstats type day enable filegen clockstats file clockstats type day enable But where did you find those options? for example I finally did statistics peerstats and the system set up a daily and total couple of files in /var/log/ntp ( my statsdir) What does filegen do and mean? Do I need it? I should have some docs where I can easily find that. Does it exist? Those are explained on the Monitoring Options page, here: http://www.eecis.udel.edu/~mills/ntp/html/monopt.html You might try using the site map for the docs. It was recently added (I think) and is a lot of help. http://www.eecis.udel.edu/~mills/ntp/html/sitemap.html -- Dennis Hilberg, Jr. timekeeper(at)dennishilberg(dot)com NTP Server Information: http://saturn.dennishilberg.com/ntp.php ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] Leap second bug?
David L. Mills [EMAIL PROTECTED] writes: The intended behavior if the servers do correctly signal a leap and the kernel is unaware of that, is that the step interval will be exceeded for about 15 minutes and then the time will be stepped. During that interval your clock will appear one second slow relative to the server that has correctly inserted a second. There will be no slew, onlly the step. The fact that your time showed otherwise suggests either the step has been disabled or something else comes unstuck. Our clocks here showed no such behavior as yours. During the 2005 leap second, I did see some of our peers show an offset of 0.5 seconds for reasons that I don't understand. For example, see the last graph on this page: http://www.maths.tcd.ie/~dwmalone/time/leap2005_peers.html It wasn't the only example - several other peers showed an offset of near 0.5 seconds after the leap - you can find those through the more graphs of other peers link at the bottom of the page. David. ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] quirky adjtimex behaviour
Hi Dean. Dean S. Messing wrote: Can I however suggest that you first try and eliminate CPU frequency scaling as a cause of the symptoms you're seeing: use cpufreq-set -g to select a policy that results in a constant CPU frequency and then check if this changes the behaviour (or renders it more predictable). ... analyzing CPU 0: no or unknown cpufreq driver is active on this CPU ... OK, this eliminates CPU frequency scaling as the cause of your problem. Sorry to have sent you off on a tangent; from recent experience this seemed like a promising low-hanhing fruit (but it turned out not to be). analyzing CPU 1: no or unknown cpufreq driver is active on this CPU analyzing CPU 2: no or unknown cpufreq driver is active on this CPU analyzing CPU 3: no or unknown cpufreq driver is active on this CPU ... If you or others wouldn't mind reading my whole original post (it's not _that_ long :-) maybe some other ideas might occur. Thanks. Sorry, I haven't a clue. Also note that I don't have any experience with SMP at all (let alone timekeeping on SMP machines). I'm very interested in this subject, but I've never been able to justify the hardware cost just so that I could play around with this. Cheers, Jan ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] ntp documentation
On 2008-01-05, Unruh [EMAIL PROTECTED] wrote: OK, I guess daily is the default if you just use the statistics peerstats But the key question is where in the world is the documentation for all of this? http://www.eecis.udel.edu/~mills/ntp/html/monopt.html Since you know the site where the Distribution Documentation is based (from my previous article) you could search for this information on Google as: site:www.eecis.udel.edu+keyword+keyword -- Steve Kostecke [EMAIL PROTECTED] NTP Public Services Project - http://support.ntp.org/ ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] The smallest possible ntpd, unoptimized
Pierre Dubuc wrote: It seems -O0 is needed, at least for building the daemon, on NetBSD-i386 on a 486SX. Case closed for me. did you try the 386 specific flag: -msoft-float uwe ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] ntp documentation
Dennis Hilberg, Jr. [EMAIL PROTECTED] writes: Unruh wrote: Richard B. Gilbert [EMAIL PROTECTED] writes: Unruh wrote: Where is there ntp documentation? For example I wanted to have ntp write out the statistics on its peers etc. I looked everywhere-- man page of ntp, ntp.conf, etc, and finally discovered by looking at the source that there seem to be a huge bunch of undocumented options. Or are they documented somewhere in that filing cabinette down some broken steps in a flooded basement, behind a door labeled Beware of Tigers You'll find the secret staircase at ntp.org. The humidity may be a little high in the basement but it's not actually wet. ;-) This snippet from my ntp.conf might help: logfile /var/ntp/ntp.log statsdir /var/ntp/ntpstats/ statistics peerstats clockstats filegen peerstats file peerstats type day enable filegen clockstats file clockstats type day enable But where did you find those options? for example I finally did statistics peerstats and the system set up a daily and total couple of files in /var/log/ntp ( my statsdir) What does filegen do and mean? Do I need it? I should have some docs where I can easily find that. Does it exist? Those are explained on the Monitoring Options page, here: http://www.eecis.udel.edu/~mills/ntp/html/monopt.html Ah. Finally. Yes, that is exactly the kind of thing I was looking for and could not find. Thanks. Those configuration pages should all be in the ntp.conf man page, instead of only some of them. You might try using the site map for the docs. It was recently added (I think) and is a lot of help. http://www.eecis.udel.edu/~mills/ntp/html/sitemap.html -- Dennis Hilberg, Jr. timekeeper(at)dennishilberg(dot)com NTP Server Information: http://saturn.dennishilberg.com/ntp.php ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] ntp documentation
Richard B. Gilbert [EMAIL PROTECTED] writes: Unruh wrote: Richard B. Gilbert [EMAIL PROTECTED] writes: Unruh wrote: Richard B. Gilbert [EMAIL PROTECTED] writes: Unruh wrote: Where is there ntp documentation? For example I wanted to have ntp write out the statistics on its peers etc. I looked everywhere-- man page of ntp, ntp.conf, etc, and finally discovered by looking at the source that there seem to be a huge bunch of undocumented options. Or are they documented somewhere in that filing cabinette down some broken steps in a flooded basement, behind a door labeled Beware of Tigers You'll find the secret staircase at ntp.org. The humidity may be a little high in the basement but it's not actually wet. ;-) This snippet from my ntp.conf might help: logfile /var/ntp/ntp.log statsdir /var/ntp/ntpstats/ statistics peerstats clockstats filegen peerstats file peerstats type day enable filegen clockstats file clockstats type day enable But where did you find those options? for example I finally did statistics peerstats and the system set up a daily and total couple of files in /var/log/ntp ( my statsdir) What does filegen do and mean? Do I need it? I should have some docs where I can easily find that. Does it exist? filegen creates a new file daily or weekly or monthly. . . . These files can eat many megabytes of disk space if you let them. If you're not prepared to analyze and summarize all the data, do yourself a favor and skip creating the files. The tools to do so are included in the ntpd distribution but you do have to find them, and use them and then clean up the obsolete files. . . . OK, I guess daily is the default if you just use the statistics peerstats But the key question is where in the world is the documentation for all of this? Same place as the rest of the doc. Have you looked in the html directory?? The stuff will display in your browser if you use the FILE://... syntax. The HTML is formatted so as to be almost as readable as plain text if you open it in an editor. Thanks. ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] quirky adjtimex behaviour
I am seeing strange behaviour on my _x86_64 Fedora 7 desktop workstation with regard to the system-cmos time that `adjtimex' reports. That leaves the RTC doing the jumping. But having an RTC that is runing nearly 1 ppm slower than my system clock and which jumps ahead every 10 seconds seems absurd. It seems that leaves two other possibilities: a bug in adjtimex or a bug in the kernel. That's where I am right now. My guess is that the system/kernel is working correctly and that the adjtimex utility is printing out misleading stuff. The CMOS/hardware clock only returns the time to the nearest second. I think that would cause quirks like this if the code has a loop that does a bit of work and sleeps for N seconds and the bit of work takes 0.1 second the time when the CMOS clock is read will drift by 0.1 second each time around the loop. If you want to play and you can find the source, try changing the code that reads the CMOS clock to spin in a loop reading it until it changes. That will give you the time early in the second. -- These are my opinions, not necessarily my employer's. I hate spam. ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] Distribution security
When I wrote that I was unaware of the html page. I'm a Unix guy and I generally don't even consider looking for html docs - I am used to (and expect) man pages. Me too. Would it help to ship dummy man pages that just pointed to the html documentation? -- These are my opinions, not necessarily my employer's. I hate spam. ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] Leap second bug?
[EMAIL PROTECTED] (David Woolley) writes: In article [EMAIL PROTECTED], Unruh [EMAIL PROTECTED] wrote: and the time required to timestamp that packet is about another 2usec, with fluctuations depending on whether other interrupts are being serviced. On both Linux and Windows, interrupt latencies of more than 4ms and even more than 10ms are quite common. The interrupt processing time I hope you mean 4 or 10usec, not msec. from the idle loop is not a good indication of the timing on a system doing real work. (The above figures are based on clock interrupts overrunning at 250 Hz and 100 Hz clock frequencies, typically when doing IDE disk I/O.) Although you might not have. The figures I got were on an active machine, although often not used that much. ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
