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Subject: Re: Followup: Losing time like crazy (1s short per 10s)
To: Matthew Seaman <matthew@FreeBSD.org>, freebsd-questions@freebsd.org
References: <20160816112002.GA3083@hephaistos.local>
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From: Arthur Chance <freebsd@qeng-ho.org>
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Date: Tue, 16 Aug 2016 13:58:36 +0100
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On 16/08/2016 13:53, Martin S. Weber wrote:
> On 2016-08-16 13:42:30, Arthur Chance wrote:
>>> (...)
>> For comparison, the same processor under 10.2 (really must find time to
>> upgrade)
>>
>> CPU: Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz (3997.77-MHz K8-class CPU)
>>
>> Timecounter "TSC-low" frequency 1998885348 Hz quality 1000
>>
>> The only thing I can think of is that I don't have turbo mode enabled:
>>
>> dev.cpu.0.freq_levels: 4001/88000 4000/88000 3800/81704 etc...
>> dev.cpu.0.freq: 4000
>>
>> What does "sysctl dev.cpu.0.freq" show on your machine?
> 
> Varies, I'm not punishing the box atm, so it might be 3300, 1300, 1000, ...
> 
> freq_levels is  (under a -p4 kernel)
> dev.cpu.0.freq_levels: 4001/88000 4000/88000 3800/81704 3500/72258
>  3300/66530 3100/60999 2900/55687 2600/48456 2400/43627 2200/39003
>  1900/32072 1700/27930 1500/23963 1300/20178 1000/15137 800/11779
> 
> for a p7 freq_levels / freq I'd need to reinstall a known (for me)
> bad upgrade again, and reboot, brr Waiting for further suggestions
> of data to collect and will do all in one go, when I'm done with
> work.

So that's one difference, you're running powerd (or equivalent) and my
box just sits at 4 GHz. A possible clue for those who know the kernel
better than me.

-- 
Schrödinger's cat had 18 half lives.