| Re: [chrony-dev] Nanosecond timestamps |
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In addition to the kernel, I disable eee and interrupt coalescing on the network interfaces.
Oh, I knew ethernet has some power saving features, but I didn't
realize they could increase latency/jitter. I'll need to experiment
with this :).
As for interrupt coalescing, it can help significantly with some
cards, but on some (e.g. i210) it seems to be adaptive and changing
the values didn't do much the last time I experimented with it. I
didn't figure out how to disable it completely.
A while ago I did some testing on interrupt coalescence
www.theory.physics.ubc.ca/scatter/rt.html
Of course the situation could have changed by now, and be card dependent,
but the effect was pretty large.
--
Miroslav Lichvar
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