[time-nuts] Linux time servers
Hal Murray
hmurray at megapathdsl.net
Fri May 15 21:44:31 UTC 2009
> The _sore_ thing is that with 2.4.x-nano kernels offsets/jitter got
> that good within minutes. Now many years later it takes days... :-(
I think that's a bug introduced by the tickless scheduler work.
> For my daytime use of ntp, convergence in less than 5 minutes is
> essential. Due to some unusual peripherials, that often have drivers
> dictating a certain kernel version its is often impossible to find a
> linux kernel version that support both the proprietary drivers and
> decent ntp-server performance.
Do you build your own kernels?
It looks like there is a simple change that fixes the convergence.
http://lkml.org/lkml/2009/5/4/373
There is also the TSC calibration mess. If you are only running on one
machine, or one type of system, you can patch the kernel to use a hard-coded
answer.
Or you can try one of the non-TSC clock sources.
--
These are my opinions, not necessarily my employer's. I hate spam.
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