Yo Dan! On Mon, 30 May 2016 14:53:31 -0500 Dan Drown <[email protected]> wrote:
> https://dan.drown.org/bbb/arp-impact/ tries to show the impact of > ARP on the request latency. Response isn't impacted because the > peer learns the ARP entry on the request. Very interesting data. Almost all the time it makes no difference, but everyone in a while it removes spikes up to 600 uSec! I have changed some "server" statements to "minpoll 4". That changes the NTP polling interval from 64 seconds to 32 seconds. Since an ARP entry is elligible for eviction at 60 seconds that is a nice cushion. After an hour I do not notice much change in jitter, but I do see improvement in offset. I think the time constant for the offset is longer than for the jitter, so it holds on to one-off errors longer. I have added a section on this to the time service howto. Thanks for brining this up. RGDS GARY --------------------------------------------------------------------------- Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703 [email protected] Tel:+1 541 382 8588
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