[ntp:questions] Effect of Gigabit Interrupt coalescence on ntp timing

David Malone dwmalone at walton.maths.tcd.ie
Tue Jun 12 18:34:32 UTC 2012


unruh <unruh at invalid.ca> writes:

>I have posted a web page
>www.theory.physics.ubc.ca/scatter/rt.html

Should the "rx-users" setting be "rx-usecs"? It would be nice if
some of these cards actually timestamped the frames when received
and then the timestamp provided by SO_TIMESTAMP or similar could
be corrected. It seems only a few cards can do this though.

(On FreeBSD these interrupt mitigation techniques should be tweakable
using the sysctls under the dev.em sysctl tree.)

        David.



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