| Re: [chrony-users] Chrony Accuracy |
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William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273
Physics&Astronomy | Advanced Research | Fax: +1(604)822-5324
UBC, Vancouver,BC | Program in Cosmology | unruh@xxxxxxxxxxxxxx
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On Tue, 12 Aug 2014, Hosam Hittini wrote:
Actually I need accuracy in the order of nano secondsIs it possible to achieve such
accuracy if I have a dedicated LAN NTP server?
No. nanosecods requires special hardware. All kinds of things-- interrupt
processing latency for example-- get in the way. Even the local reading of the
system clock becomes problematic at that level. Microsends or even
submicroseconds is possible. nsec on ordinary computer kit is not.
This is not a problem with chrony per se. It is a problem with the hardware.
Thanks
Regards,
Eng. Hosam Hittini
On Aug 12, 2014, at 12:43 PM, Holger Hoffstätte <holger.hoffstaette@xxxxxxxxxxxxxx> wrote:
On 08/12/14 10:13, Hosam Hittini wrote:
I was wondering how accurate Chrony is, in terms of seconds
Very. The built-in stats say that my inhouse server with a Stratum-1 upstream
source at my ISP is currently "0.000010289 seconds fast of NTP time". That's
10µs.
If you are thinking in terms of "seconds", chrony is good enough for you. :)
-h
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