Re: [time-nuts] NTP and Windows 7
Hal, Hal Murray wrote: martin.burni...@burnicki.net said: Please note under Windows you should configure all upstream servers with a line reading server aa.bb.cc.dd iburst minpoll 6 maxpoll 6 There are lots of times when reducing maxpoll is reasonable, but I think an unqualified suggestion is not appropriate. I don't think my suggestion was unqualified. ;-) We have already discussed this in the NTP newsgroup/questions mailing list. Here is a loopstats graph from a Windows XP system running ntpd 4.2.6p5 without limitation of maxpoll: http://people.ntp.org/burnicki/windows/ntpd-4.2.6p5-WinXP-no_poll_limit.pdf And if you limit maxpoll to 6 in the same installation the results look like this: http://people.ntp.org/burnicki/windows/ntpd-4.2.6p5-WinXP-poll_6.pdf A loopstats graph from another test with ntp-dev running on Windows 7 without limitation of the polling interval are here: http://people.ntp.org/burnicki/windows/ntpd-4.2.7-Win7-poll4-max.pdf And similarly, with limitation of the polling interval to 6: http://people.ntp.org/burnicki/windows/ntpd-4.2.7-Win7-poll4-6.pdf In the examples above I had minpoll set to 4, just to see how the fix for NTP bug 2328 behaves, and you can clearly see that time synchronization is degraded if the polling interval is *below* 6 since the workaround doesn't work properly, as mentioned in the bug report. So I wouldn't suggest anyway to set minpoll below 6. maxpoll of 6 polls every 64 seconds. The default maxpoll is 10, or 1024 seconds, so that's a 16x[1] increased load on the servers. Some/many people would consider that to be abusive use of a resource. If you are using your servers, you can do whatever you want. If you are using your ISP's servers or a friends, then whatever they agree to is fine. The NIST servers are already heavily/over loaded. I'm not sure if the pool could stand a 16x increase in load. I agree that limiting maxpoll isn't the best choice if you can avoid it. However, by default ntpd starts at minpoll 6 anyway, it determines automatically if the polling interval can be increased towards 10, or be decreased again towards 6. You can see how the interval is decreased automatically in the loopstats for 4.2.6/Win XP, if the time discipline becomes too bad. So public services should anyway account for clients sticking a the default lowest poll interval, namely 6. And of course it is generally not a good idea to let each laptop get its time directly from the primary servers at NIST or PTB, but this is a different problem. Martin ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NTP and Windows 7
That box runs a mode-s receiver and netflix. I need silverlight and basestation. Hey, I don't like paying the windows tax. If you look at my email header, I'm on linux. ;-) On Sun, 30 Mar 2014 06:30:01 +0100 David J Taylor david-tay...@blueyonder.co.uk wrote: From: Chris Albertson One question. Why is this system running Microsoft Windows? [] === Because the OP is using the system to run Windows software. The OS is chosen to meet the needs of the application. Here's the performance of a Netbook PC here (Samsung N150 plus) also running an Intel Atom, and also running the same software which John runs. It's synced over Wi-Fi to a local stratum-1 server, with both minpoll and maxpoll set to 5. http://www.satsignal.eu/mrtg/performance_ystad.php As you can see, it mostly within a millisecond, with occasional excursions to two milliseconds. It's quite adequate for the software in question, which only needs the time to within a fraction of a second. Cheers, David ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NTP and Windows 7
How much RAM? Was this system originally running WinXP and has been upgraded to Win7 or is this a new system. I am thinking of something very specific. Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of nuts Sent: Thursday, March 27, 2014 22:22 To: time-nuts@febo.com Subject: Re: [time-nuts] NTP and Windows 7 I used David's plotting program and determined the MS antivirus (MS security essentials) would interfere with NTP. Possibly the additional CPU load raised internal temperature, which in turn effected the RTC. And of course, the work load itself could have been an issue. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NTP and Windows 7
If this is for me, the Atom has 4Gbytes and has always run win7pro 64 bit. The NTP is via Meinberg. The Atom is dual core. D525. On Sat, 29 Mar 2014 00:41:01 -0700 DaveH i...@blackmountainforge.com wrote: How much RAM? Was this system originally running WinXP and has been upgraded to Win7 or is this a new system. I am thinking of something very specific. Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NTP and Windows 7
One question. Why is this system running Microsoft Windows? I have the same D525. I've had both Linux and BSD on it. I eventually settled on BSD and performance is very good. Windows is a bit sluggish on Atom. I was using it as a file/web/NTP server. At first I was not getting acceptable performance then found out he built-in Ethernet controller is poor. I installed an Intel card and then was able to get wire speed on a gigabit Ethernet. The NTP server ran flawlessly. Night and day better performance after upgrading the Ethernet. In an effort ton reduce power even more I've moved to an ARM based system. On Sat, Mar 29, 2014 at 8:55 PM, nuts n...@lazygranch.com wrote: If this is for me, the Atom has 4Gbytes and has always run win7pro 64 bit. The NTP is via Meinberg. The Atom is dual core. D525. On Sat, 29 Mar 2014 00:41:01 -0700 DaveH i...@blackmountainforge.com wrote: How much RAM? Was this system originally running WinXP and has been upgraded to Win7 or is this a new system. I am thinking of something very specific. Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Chris Albertson Redondo Beach, California ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NTP and Windows 7
From: Chris Albertson One question. Why is this system running Microsoft Windows? [] === Because the OP is using the system to run Windows software. The OS is chosen to meet the needs of the application. Here's the performance of a Netbook PC here (Samsung N150 plus) also running an Intel Atom, and also running the same software which John runs. It's synced over Wi-Fi to a local stratum-1 server, with both minpoll and maxpoll set to 5. http://www.satsignal.eu/mrtg/performance_ystad.php As you can see, it mostly within a millisecond, with occasional excursions to two milliseconds. It's quite adequate for the software in question, which only needs the time to within a fraction of a second. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] NTP and Windows 7
Greetings from Wales. I'm not sure whether this august forum is the appropriate place to ask a question about PC timekeeping, but in the hope that someone can point me in the right direction I'll ask anyway ;-) I have just replaced Windows XP with Windows 7. The PC involved (a fairly elderly 2.4GHz Core2 machine) runs an application called 'PlanePlotter' which requires accurate timekeeping and mandates Meinberg's NTP software. Using the UK pool.ntp.org servers as a reference source this has worked very well under XP for several years and the clock was seldom more than a few milliseconds out. Under Windows 7, however, the clock can be anything up to 0.2s awry and the offset is very erratic. The daily loopstats graph looks like a section through a mountain range. I have carefully checked all settings and combed the internet for suggestions but can see no reason for the sharply degraded performance. Is there something about Windows 7 that degrades the performance of NTP? Or is there anything subtle I can check? Many thanks in advance. John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NTP and Windows 7
At 08:59 AM 3/27/2014, John Nelson wrote: there something about Windows 7 that degrades the performance of NTP? Or is there anything subtle I can check? I've had some luck on win7 by setting maxpoll to 8. -- newell ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NTP and Windows 7
On 2014-03-27 07:59, John Nelson wrote: Greetings from Wales. I'm not sure whether this august forum is the appropriate place to ask a question about PC timekeeping, but in the hope that someone can point me in the right direction I'll ask anyway ;-) I have just replaced Windows XP with Windows 7. The PC involved (a fairly elderly 2.4GHz Core2 machine) runs an application called 'PlanePlotter' which requires accurate timekeeping and mandates Meinberg's NTP software. Using the UK pool.ntp.org servers as a reference source this has worked very well under XP for several years and the clock was seldom more than a few milliseconds out. Under Windows 7, however, the clock can be anything up to 0.2s awry and the offset is very erratic. The daily loopstats graph looks like a section through a mountain range. I have carefully checked all settings and combed the internet for suggestions but can see no reason for the sharply degraded performance. Is there something about Windows 7 that degrades the performance of NTP? Or is there anything subtle I can check? NTP list - setup at http://lists.ntp.org/listinfo/questions - might be better. Search archives for relevant topics. Power saving is more ubiquitous with Win 7 and it defaults to Balanced, with high jitter, and system changes make it a less consistent timekeeper than XP - Windows 8 is better. Ensure your BIOS is set to as much as possible disable spread spectrum (reduces RFI) and sleep states (reduces power). Go to Control Panel/Power, ensure your Power profile is set to High Performance and Put the computer to sleep is set to Never, then go into Advanced settings and set more things to Maximum Performance, Never, Disabled, or 100% as appropriate. -- Take care. Thanks, Brian Inglis ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NTP and Windows 7
Win7 has a higher requirement for system resources than XP. This is not generally a bad thing as it is doing a lot more but still... How much RAM do you have installed. Open your Task Manager/Performance and see what your load is. Also, the PlanePlotter website says that it runs on XP -- are you running something else that could load the system to the point where Win7 stutters? http://www.coaa.co.uk/planeplotter.htm Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of John Nelson Sent: Thursday, March 27, 2014 07:00 To: time-nuts@febo.com Subject: [time-nuts] NTP and Windows 7 Greetings from Wales. I'm not sure whether this august forum is the appropriate place to ask a question about PC timekeeping, but in the hope that someone can point me in the right direction I'll ask anyway ;-) I have just replaced Windows XP with Windows 7. The PC involved (a fairly elderly 2.4GHz Core2 machine) runs an application called 'PlanePlotter' which requires accurate timekeeping and mandates Meinberg's NTP software. Using the UK pool.ntp.org servers as a reference source this has worked very well under XP for several years and the clock was seldom more than a few milliseconds out. Under Windows 7, however, the clock can be anything up to 0.2s awry and the offset is very erratic. The daily loopstats graph looks like a section through a mountain range. I have carefully checked all settings and combed the internet for suggestions but can see no reason for the sharply degraded performance. Is there something about Windows 7 that degrades the performance of NTP? Or is there anything subtle I can check? Many thanks in advance. John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NTP and Windows 7
Greetings from Wales. I'm not sure whether this august forum is the appropriate place to ask a question about PC timekeeping, but in the hope that someone can point me in the right direction I'll ask anyway ;-) I have just replaced Windows XP with Windows 7. The PC involved (a fairly elderly 2.4GHz Core2 machine) runs an application called 'PlanePlotter' which requires accurate timekeeping and mandates Meinberg's NTP software. Using the UK pool.ntp.org servers as a reference source this has worked very well under XP for several years and the clock was seldom more than a few milliseconds out. Under Windows 7, however, the clock can be anything up to 0.2s awry and the offset is very erratic. The daily loopstats graph looks like a section through a mountain range. I have carefully checked all settings and combed the internet for suggestions but can see no reason for the sharply degraded performance. Is there something about Windows 7 that degrades the performance of NTP? Or is there anything subtle I can check? Many thanks in advance. John === John, Two suggestions: - stop NTP, delete the file etc\ntp.drift, and restart NTP. Sometimes it can get a wild value for no obvious reason. - be sure you are running the latest development version of NTP (4.2.7p434). See: http://www.satsignal.eu/ntp/setup.html#updating At the back of my mind is a bug report suggesting using a poll interval of no greater than - possibly 7 - but the details aren't to hand. Also power-saving may be running the clock at different rates at different times. Perhaps try disabling some of the power-saving options. The only non-stratum-1 Windows 7 system I have here is Wi-Fi synced to a local stratum-1 server, and its performance is here: http://www.satsignal.eu/mrtg/performance_ystad.php It's currently working from a microADSB stick and uploading only, to Plane Plotter. You cam also want to ask on the Usenet newsgroup, also accessible through Google groups: nntp://comp.protocols.time.ntp https://groups.google.com/forum/#!forum/comp.protocols.time.ntp Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NTP and Windows 7
From: DaveH [] Also, the PlanePlotter website says that it runs on XP -- are you running something else that could load the system to the point where Win7 stutters? http://www.coaa.co.uk/planeplotter.htm Dave = Dave, The Web site is pessimistic (and in need of a minor update). Plane Plotter runs without issue or high resource loading on Windows XP, Vista, 7 and 8/8.1, 32-bit and 64-bit. The time accuracy it needs is just to within a second, so NTP normally provides more than adequate performance, but has the advantage of begin so much more robust than those (how I hate the term) Atomic Time programs. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] NTP and Windows 7
Many thanks to those who replied. I've joined the NTP list and some messages in the archive suggest that the NTP/Win 7 timekeeping problem has already been raised there. In the meantime I've adjusted the power-management and some device settings as suggested. In response to a question, the machine has 4GB or RAM and the worst-case load reported by Task Manager is about 65%. Also, the PlanePlotter website says that it runs on XP -- are you running something else that could load the system to the point where Win7 stutters? I don't think so. PlanePlotter only seems to drive the system up to about 60-65% every now and then, presumably when it's downloading and uploading fixes. John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NTP and Windows 7
John Nelson wrote: Greetings from Wales. I'm not sure whether this august forum is the appropriate place to ask a question about PC timekeeping, but in the hope that someone can point me in the right direction I'll ask anyway ;-) I have just replaced Windows XP with Windows 7. The PC involved (a fairly elderly 2.4GHz Core2 machine) runs an application called 'PlanePlotter' which requires accurate timekeeping and mandates Meinberg's NTP software. Using the UK pool.ntp.org servers as a reference source this has worked very well under XP for several years and the clock was seldom more than a few milliseconds out. Under Windows 7, however, the clock can be anything up to 0.2s awry and the offset is very erratic. The daily loopstats graph looks like a section through a mountain range. I have carefully checked all settings and combed the internet for suggestions but can see no reason for the sharply degraded performance. Is there something about Windows 7 that degrades the performance of NTP? Or is there anything subtle I can check? The latest Windows bug which came to our attention is that some Windows versions don't apply small time adjustments at all. For example, if NTP applies an adjustment less than 16 ticks to the Windows time this is simply ignored by Windows. However, NTP expects the adjustment to have some effect, but if there is no effect then the next time comparison yields a much larger difference than expected, and thus causes another adjustment which is probably larger than necessary. As a summary this can cause large swings in the time adjustment values. A developer version of the NTP package contains a workaround for this Windows bug. The report and fix are discussed here: NTP Bug 2328 - Vista/Win7 time keeping inaccurate and erratic https://bugs.ntp.org/show_bug.cgi?id=2328 The problem is also explained on the Microsoft support page: SetSystemTimeAdjustment May Lose Adjustments Less than 16 http://support.microsoft.com/kb/2537623 Even though the MS report only mentions Windows 7, the Windows Server 2008 kernel is similar to Windows 7 and has probably the same bug. So if you want to give it a try you can download a NTP developer version here which includes a workaround: http://people.ntp.org/burnicki/windows/ (The latest ntp-dev version also contains this fix, so alternatively you can use that one, as siuggested by David Taylor) You should try the release version first. Just unzip the ZIP archive, stop the NTP service, copy all extracted files over the files in your NTP installation directory (e.g. C:\Program Files (x86)\NTP\bin\), and restart the NTP service. We have found that this version has greatly improved the resulting accuracy on Windows 7 and Windows Server 2008 installations. Please note under Windows you should configure all upstream servers with a line reading server aa.bb.cc.dd iburst minpoll 6 maxpoll 6 where aa.bb.cc.dd has to be replaced with the host name or IP address of your NTP server. Generally you should use a polling interval as short as possible under windows to let let ntpd apply adjustments quickly. However, please don't use polling intervals below 6 with the developer version since this prevents the workaround from working correctly as discussed in the bug report. Also, higher polling intervals can cause problems under Windows. See: NTP Bug 2341 - ntpd fails to keep up with clock drift at poll 7 http://bugs.ntp.org/show_bug.cgi?id=2341 So our advice is to use minpoll 6 maxpoll 6 as indicated in the example above. The patched ntpd has caused no drawbacks on any Windows machines, but has improved accuracy on a number of installations. The directory http://people.ntp.org/burnicki/windows/ contains also some loopstats graphs as PDF files which show the improvement: http://people.ntp.org/burnicki/windows/bug2328_workaround.pdf http://people.ntp.org/burnicki/windows/bug2328_workaround_fine.pdf Martin ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NTP and Windows 7
From: Martin Burnicki You should try the release version first. Just unzip the ZIP archive, stop the NTP service, copy all extracted files over the files in your NTP installation directory (e.g. C:\Program Files (x86)\NTP\bin\), and restart the NTP service. == Martin, Many thanks for your input and recommendations. I'm lucky here to have many stratum-1 servers on the LAN to which I can lock quite tightly, so I don't see some of the issues to which the Internet-only users are exposed. Just a small point, as the user needs to edit files associated with NTP (e.g. ntp.conf, leapseconds file), and as NTP needs to write files regularly itself (e.g. drift and any statistics), I have been recommending users to install outside the now protected C:\Program Files\ tree, into e.g. C:\Tools\NTP\. This applies to quite a few other programs where the user is still expected to be able to edit e.g. .INI files etc. This is the reasoning behind my installation instructions for Windows here: http://www.satsignal.eu/ntp/setup.html I appreciate that there are other, perhaps better, ways to solve this problem, but at least my approach avoids the confusion caused to the user by Microsoft's virtualised directories, and the other consequences that mechanism has. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NTP and Windows 7
martin.burni...@burnicki.net said: Please note under Windows you should configure all upstream servers with a line reading server aa.bb.cc.dd iburst minpoll 6 maxpoll 6 There are lots of times when reducing maxpoll is reasonable, but I think an unqualified suggestion is not appropriate. maxpoll of 6 polls every 64 seconds. The default maxpoll is 10, or 1024 seconds, so that's a 16x[1] increased load on the servers. Some/many people would consider that to be abusive use of a resource. If you are using your servers, you can do whatever you want. If you are using your ISP's servers or a friends, then whatever they agree to is fine. The NIST servers are already heavily/over loaded. I'm not sure if the pool could stand a 16x increase in load. How many other countries run official NTP servers, and how heavily are they loaded? -- 1) It's not actually 16x because there is the ramp up time and ntpd automatically ramps down when it thinks it needs to. The latter often happens if the temperture/load changes. -- These are my opinions. I hate spam. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
[time-nuts] NTP and Windows 7
You should try the release version first. Just unzip the ZIP archive, stop the NTP service, copy all extracted files over the files in your NTP installation directory (e.g. C:\Program Files (x86)\NTP\bin\), and restart the NTP service. Very many thanks to Martin and David for the information. I've extracted 4.2.7p434, added maxpoll and minpoll statements to the CONF file and restarted. Fingers crossed for an improvement! More tomorrow when hopefully everything's settled down. John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NTP and Windows 7
Hi David My question was not that it runs on XP, I was asking if you are running some other software on your Win7 machine that might occasionally hit up the system resources to the point where the system stutters. Backup programs can do this. Applications that look for newer versions when they load can cause a network hit. Lots of stuff. Java and Flash are notorious for causing memory and timing problems. Cheers! Dave -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of David J Taylor Sent: Thursday, March 27, 2014 09:57 To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] NTP and Windows 7 From: DaveH [] Also, the PlanePlotter website says that it runs on XP -- are you running something else that could load the system to the point where Win7 stutters? http://www.coaa.co.uk/planeplotter.htm Dave = Dave, The Web site is pessimistic (and in need of a minor update). Plane Plotter runs without issue or high resource loading on Windows XP, Vista, 7 and 8/8.1, 32-bit and 64-bit. The time accuracy it needs is just to within a second, so NTP normally provides more than adequate performance, but has the advantage of begin so much more robust than those (how I hate the term) Atomic Time programs. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NTP and Windows 7
Hi David My question was not that it runs on XP, I was asking if you are running some other software on your Win7 machine that might occasionally hit up the system resources to the point where the system stutters. Backup programs can do this. Applications that look for newer versions when they load can cause a network hit. Lots of stuff. Java and Flash are notorious for causing memory and timing problems. Cheers! Dave == My apologies, Dave. When I looked at the Web site I saw that the works on all Windows was clearly stated. You ask a good question, but in my experience with NTP load from other software has not been a major issue (NTP runs at realtime priority), except in the higher CPU temperature that extra load can cause, and therefore change the frequency of the low-cost CPU crystal on the motherboard, and hence NTP will run at a higher offset while it is correcting for the new frequency. This effect clearly shows on one of my PCs which has a regular disk-defragmentation job - 100% CPU and also higher disk load and temperature - causing the spikes on the graphs: http://www.satsignal.eu/mrtg/bacchus_ntp_2.html The is a very old PC running Windows 2000 on a Pentium III 550 MHz - remember those? Even then, the spikes are at the millisecond level, not the fraction of a second level John was reporting. Cheers, David -- SatSignal Software - Quality software written to your requirements Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] NTP and Windows 7
I used David's plotting program and determined the MS antivirus (MS security essentials) would interfere with NTP. Possibly the additional CPU load raised internal temperature, which in turn effected the RTC. And of course, the work load itself could have been an issue. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
