| Re: [chrony-dev] [PATCH] MacOS X - Increase priority of chronyd process |
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- To: chrony-dev@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-dev] [PATCH] MacOS X - Increase priority of chronyd process
- From: Bryan Christianson <bryan@xxxxxxxxxxxxx>
- Date: Mon, 24 Aug 2015 20:00:56 +1200
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> On 24/08/2015, at 7:17 pm, Miroslav Lichvar <mlichvar@xxxxxxxxxx> wrote:
>
> On Mon, Aug 24, 2015 at 08:55:28AM +1200, Bryan Christianson wrote:
>> Run chronyd with a 'nice' value of -15. Also run chronyd as a near real time process to prevent pre-empting of timing calculations and adjustments. This patch has the effect of removing an observed 1usec bias from the mean 'System time' offset.
>
> Should this be enabled by default? I suspect most users won't care
> about 1us offset. How about making it configurable with the -P option?
> If there is no scale as with the Linux SCHED_FIFO priority, it could
> be just 0 for disabled and 1 enabled.
I guess I was thinking of a lab situation where precision timing between is required as being the use case
Yes - I had thought we would need to make it optional, just wasn't sure how it should be implemented. I don't think it needs scaling - the settings suggested in the Apple tech-note seem to work well and I don't think there is a need for a user setting that if configured inappropriately could be detrimental to the system as a whole.
I'll resubmit the patch so it uses -P
Regards
Bryan
--
Bryan Christianson
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