linux-kernel - Re: Skylake (XPS 13 9350) TSC is way off

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Message-ID: <5677B3EB.9030908@jonmasters.org>
Date:	Mon, 21 Dec 2015 03:10:19 -0500
From:	Jon Masters <jonathan@...masters.org>
To:	John Stultz <john.stultz@...aro.org>,
	Andy Lutomirski <luto@...nel.org>
CC:	"Brown, Len" <len.brown@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>,
	"Hunter, Adrian" <adrian.hunter@...el.com>
Subject: Re: Skylake (XPS 13 9350) TSC is way off

On 12/2/15, 6:55 PM, John Stultz wrote:
> On Wed, Dec 2, 2015 at 3:42 PM, Andy Lutomirski <luto@...nel.org> wrote:

>>> On a hunch, are you running chrony instead of ntpd?
>>
>> Yes, this is indeed chrony.
>
> Ok. I'll have to look closer. The last time that message came up it
> was in a report of a bug that chrony uncovered with the internal
> correction being too slow. I know chrony is much more aggressive
> compared to ntpd in tweaking the freq value for the initial converging
> correction at startup, so maybe that along with something else is
> causing us to get out of spec.

Can you copy me on followup? I'm seeing similar behavior with chrony on 
recent kernels on a couple of different ARM server prototype systems.

Jon.

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