| 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 20:02:15 +1200
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> On 24/08/2015, at 7:53 pm, Bryan Christianson <bryan@xxxxxxxxxxxxx> wrote:
>
>
>> On 24/08/2015, at 11:06 am, Bill Unruh <unruh@xxxxxxxxxxxxxx> wrote:
>>
>> Are you sure that there is a 1us offset? How do you measure that? Remember
>> that anything in the computer has latency and 1us is not that long a time. Ie, it takes a bit of work to measure that offset to that accuracy.
>
> I am reading the 'Rem. corr.' value from /var/log/chrony/tracking.log
> running this through a low pass filter and plotting the result. The graphs clearly show approximately 1 to 2 us offset when running chronyd at default priority. There are couple of graphs at my website that show the effect of enabling real-time scheduling.
Oops - Forgot the url: http://whatroute.net/chrony/index.html
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