CPU load on FreeBSD. Classic NTP 5-6% vs NTPsec 10-17%

Hal Murray hmurray at megapathdsl.net
Fri Dec 13 21:07:17 UTC 2019

> I'm not familiar with how FreeBSD accounts CPU, but NTPsec uses a second
> thread for DNS lookups.  If the traffic triggers lots of DNS lookups, the CPU
> gets accounted for in ticks per core and the ticks are fairly long, you could
> probably expect to see about twice the load. 

The extra thread only does DNS lookups for names on server lines in your 
ntp.conf.  Also the NTS-KE dance to setup the cookies used by NTS.

External traffic can't start exttra threads.

These are my opinions.  I hate spam.

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