[Pool] Score is drop in cycles

Jeff Woolsey jlw at jlw.com
Fri Feb 21 05:58:23 UTC 2014


On 02/20/14 12:21, Timothy Oefelein wrote:
>
> One of the these days I'd like to get the hardware to run my own 
> Stratum 1 server, which would make the whole finding peers process 
> moot. :)

Not necessarily.  Trust but verify your local reference clock against 
other servers out there.  For example, I'm currently seeing about 60ms 
of jitter/offset in the SHM refclock from gpsd managing a SiRF II 
device.  (It was 10 seconds off before I fixed gpsd not to request 
messages it's ignoring anyway.).  It's USB, but still I'd expect only 
1-2ms of offset/jitter, which is fine for my purposes:

(not my pool server)

      remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
xSHM(0)          .GPS.            0 l   15   16  377    0.000   12.617   8.012
+c-98-210-122-78 128.9.176.30     2 u   55   64  377    0.832  -49.285   3.556
+PBG4-gigabit.in 17.171.4.14      3 u   45   64  377    0.756  -49.980   2.588
*clock.xmission. .GPS.            1 u   14  128  377   46.021  -52.549   7.084
-bacon.sorch.inf 129.128.5.210    2 u   48   64  377  185.294  -57.130   5.163
+log1.nierle.com 192.53.103.108   2 u    1  128  377  174.769  -52.600   4.201
+guti.uc3m.es    140.7.62.122     2 u   26   64  377  184.012  -48.588   6.591
-bombast         128.9.176.30     2 u  978 1024  376    9.240  -28.597  11.166


Not to mention reception problems you may have with any radio clock 
(incl. GPS), or other failures such as [rugrats] kicking the cord loose, 
or pe[s]ts chewing through it, or...

That said, you should be able to manage that for less than $50, probably 
much less these days.

-- 
Jeff Woolsey {woolsey,jlw}@{jlw,jxh}.com first.last@{gmail,jlw}.com
Spum bad keming.
Nature abhors a straight antenna, a clean lens, and unused storage capacity.
"Delete! Delete! OK!" -Dr. Bronner on disk space management
"Card sorting, Joel." -me, re Solitaire



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