time consistently behind 6 seconds every day

[reed%reedmedia.net@localhost]

See these daily NTP offsets:

Jul 19 20:40:14 t1 ntpdate[16879]: step time server 23.239.26.89 offset 
6.039924 sec
Jul 20 20:40:14 t1 ntpdate[4698]: step time server 206.55.191.142 offset 
6.038794 sec
Jul 21 20:40:14 t1 ntpdate[22152]: step time server 69.89.207.99 offset 
6.036992 sec
Jul 22 20:40:14 t1 ntpdate[20684]: step time server 96.42.83.78 offset 
6.039788 sec
Jul 23 20:40:15 t1 ntpdate[27466]: step time server 96.235.18.130 offset 
6.036430 sec
Jul 24 20:40:14 t1 ntpdate[908]: step time server 198.46.248.36 offset 
6.039517 sec

That is from a daily cron job running ntpdate.

I know I can run ntpd to keep in sync and I will probably do that on 
this system.

But are there any NetBSD tunings that I should consider to also make 
sure its system better keeps track of time?

NetBSD 8.0 amd64. Please let me know about any sysctls or dmesg output 
or other diagnostic info that may be useful.

Thanks!

  Jeremy C. Reed

p.s. I noticed this because I flagged a DNS RRSIG Inception time in the 
future by 6 seconds off. I checked and I was off by 5.717946 and fixed a 
moment later and I was off by 5.726703. Still I think the other system 
was at least a fraction of a second fast since was serving very new 
signature.

echo 'EhZ[h ^jjf0%%h[[Zc[Z_W$d[j%Xeeai%ZW[ced#]dk#f[d]k_d%' | \
  tr            '#-~'            '\-.-{'