Hello,
I know FreeBSD can be used with great success for timing solutions (at
least two core members do it ?).
has someone some performance data of the quality of system clock
synchronization, while using NTPd with a GPS reveiver and a hard 1PPS
signal ?
More precisely : is it reasonable to
On Wed, Aug 22, 2001 at 09:47:34PM +0200, Thierry Herbelot wrote:
Hello,
I know FreeBSD can be used with great success for timing solutions (at
least two core members do it ?).
has someone some performance data of the quality of system clock
synchronization, while using NTPd with a GPS
In message [EMAIL PROTECTED] Thierry Herbelot writes:
: I know FreeBSD can be used with great success for timing solutions (at
: least two core members do it ?).
Well, there's one core member, and a second committer. Or was until a
few days ago...
: has someone some performance data of the
In message [EMAIL PROTECTED] Wilko Bulte writes:
: On Wed, Aug 22, 2001 at 09:47:34PM +0200, Thierry Herbelot wrote:
: Hello,
:
: I know FreeBSD can be used with great success for timing solutions (at
: least two core members do it ?).
:
: has someone some performance data of the quality
In message [EMAIL PROTECTED], Warner Losh writes:
: More precisely : is it reasonable to hope having a system clock not
: farther from the GPS clock by more than 50 micro-seconds ?
50 microseconds should be feasible provided that you either
provide a very stable temperature or replace the
In message 46651.998541806@critter Poul-Henning Kamp writes:
: In message [EMAIL PROTECTED], Warner Losh writes:
:
: : More precisely : is it reasonable to hope having a system clock not
: : farther from the GPS clock by more than 50 micro-seconds ?
:
: 50 microseconds should be feasible
beyond normal HVAC and stock xtals on the motherboard. This is
after we've done the fast interrupt hack. Without it, the other
system activity was causing enough interrupt latncy variance that we
would see more like +- 80us with outliers way off in the weeds
(+- just under 10ms!).
Warner,
In message [EMAIL PROTECTED] Luigi Rizzo writes:
: Is this the case ? And if so, what is the fast interrupt hack that you
: are mentioning and how would it improve things ?
Yes. I think so. We were measuring on a 5x86 at 133MHz, so the
effect would be exagerated more.
The hack that we did was
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