[ntp:questions] Score is low and not raising

William Unruh unruh at invalid.ca
Tue Jun 8 16:06:09 UTC 2021


As I said, at a minimum run a test in which you have at least one
network pool source to compare your system with some independent outside
system. Why demand that pool people do it for you? Since you want to be
on the pool you must have network connectivity.

On 2021-06-08, ProGeek <progeekro at gmail.com> wrote:
> ok,
> fixed.
>
> now stats looks like this:
>
>
> Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset  Std Dev
>==============================================================================
> GPS0                        6   3    82    +16.101    190.363    -80ms  1527us
> SHM1                        7   4    94     +0.000      0.020   -740ms   239ns
> PPS0                        7   4    94     +0.000      0.020     +0ns   239ns
>
> MS Name/IP address         Stratum Poll Reach LastRx Last sample
>===============================================================================
> #? GPS0                          0   4   377    10    -80ms[  -80ms] +/-  100ms
> #- SHM1                          0   4   377    11   -740ms[ -740ms] +/- 1000us
> #* PPS0                          0   4   377    11   +264ns[ +922ns] +/-  208ns
>
> Hope that will make the score higher
>
>
> On Tuesday, June 8, 2021 at 11:23:09 AM UTC+3, William Unruh wrote:
>> On 2021-06-08, ProGeek <prog... at gmail.com> wrote: 
>> > hello, 
>> > 
>> > I am using Chrony as a server. 
>> > 
>> > i manage to lower the offset to 97ms hope is OK like this...or i will try new settings 
>> > 
>> > now chrony stats reports are like this: 
>> > 
>> > MS Name/IP address Stratum Poll Reach LastRx Last sample 
>> >=============================================================================== 
>> > #* GPS0 0 3 377 5 -1167us[-2018us] +/- 98ms 
>> > #x PPM1 0 3 377 4 -406ms[ -406ms] +/- 2497us 
>> > #? PPS0 0 3 0 - +0ns[ +0ns] +/- 0ns
>> Well, pps is not working at all. I have no idea what PPM1 is, and your 
>> system is using GPS0 as its source, which is not a good idea, since it 
>> will be out by many may ms. If you got pps to work, it should have an 
>> accuracy or a few micro seconds, not many ms. (GPS is the NMEA sentences 
>> which are always delayed by about over 100ms.) 
>> 
>> So, figure out why pps is not working, and fix that. In the meantime 
>> without your system actually set up properly in itself, you should not 
>> be going onto the pool and leading others astray.
>> > 
>> > On Tuesday, June 8, 2021 at 10:49:53 AM UTC+3, William Unruh wrote: 
>> >> You give no details at all so it is hard to figure out what you are 
>> >> doing never mind what is wrong. It seems you have a 500 ms (1/2 second) 
>> >> offset, which really is pretty terrible. Wrong edge on the interrupt? 
>> >> ( and at the end it inexplicably drops to 100ms, which is still pretty 
>> >> terrible but better-- what changed) 
>> >> 
>> >> Hook you Pis up to the network, and compare your PPS yourself to some 
>> >> pool server. That way you can debug yourself instead of others doing it 
>> >> for you. 
>> >> On 2021-06-08, ProGeek <prog... at gmail.com> wrote: 
>> >> > Hello, 
>> >> > i have 2 IPv6 servers made publicly some days ago. 
>> >> > Servers are build around Raspberry PI and U-blox GPS modules, using PPS and GPIO. 
>> >> > The problem is that i try to make the servers available in pool, but i get constant -20 on rating. 
>> >> > 
>> >> > Any idea how can i improve the score? 
>> >> > 
>> >> > https://www.ntppool.org/scores/2a02:2f04:a0e:9199:99::2 
>> >> > 
>> >> > https://www.ntppool.org/scores/2a02:2f04:a0e:9199:99::2



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