Re: [ntp:questions] Realistic Performance Expectation for GPS PPS fed ntpd jitter

2020-10-15 Thread Matt Corallo
ed to make sure it works for the 8250-based UART in my box, YMMV, apologies in advance that email will almost certainly break lines in it. Its really much more trivial than you were thinking :) Matt commit 85aa50c40dae86b2d5051902e72fc1b18c1c8563 Author: Matt Corallo Date: Sun Sep 27 23:02:24

Re: [ntp:questions] Realistic Performance Expectation for GPS PPS fed ntpd jitter

2020-10-15 Thread Matt Corallo
I was wondering about this too, so sat down and patched kernel to pull timestamps right after the interrupt fires and then decide later if it was because of DCD change (passing the timestamp through the dcd_change callback, its a pretty trivial patch). It cut the jitter down some (a few us, maybe

Re: [ntp:questions] create charts

2020-09-17 Thread Matt Corallo
NTPSec's ntpviz seems to be happy eating output from ntpd's peer/loopstats logs and generates pretty graphs with python and rrdtool. Matt On 9/16/20 2:12 PM, Rob van der Putten wrote: Hi there On 23/08/2020 14:10, Uwe Klein wrote: Anybody else getting "request received" from TheFork and

[ntp:questions] Mailing List Maintenance

2020-09-16 Thread Matt Corallo
It looks like the ML's SpamAssassin is confiugred with at least one DNSBL which stopped working in 2015 (and now returns true for everything - DNS_FROM_AHBL_RHSBL) and probably a few more per the wiki. More importantly, there seems to be at least 5 folks who managed to register a ticket system t

Re: [ntp:questions] Multiple PPS Lines

2020-09-16 Thread Matt Corallo
Also, while I'm on the subject, what about multiple "prefer" peers? I've seen several folks indicate that they have "two GPS receivers" or the like, but there doesn't seem to be a good way to configure ntpd for that use-case. Matt On 9/15/20 12:26 PM, Matt C

[ntp:questions] Multiple PPS Lines

2020-09-16 Thread Matt Corallo
Is there any interest in a patch to select across multiple PPS lines (maybe median of the available lines, or maybe using clock_combine) instead of just blindly taking the first one? This would also allow us to take the second available PPS line if the first one fails the "within 400ms" requireme