From: Andy Lutomirski <luto@kernel.org>
To: John Stultz <john.stultz@linaro.org>
Cc: Andy Lutomirski <luto@kernel.org>,
"Brown, Len" <len.brown@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
X86 ML <x86@kernel.org>,
"Hunter, Adrian" <adrian.hunter@intel.com>
Subject: Re: Skylake (XPS 13 9350) TSC is way off
Date: Wed, 2 Dec 2015 15:59:28 -0800 [thread overview]
Message-ID: <CALCETrVPrhXqqPP-7DMF6YHrBacm-tWBrSweF3_bZ7oPH5gsig@mail.gmail.com> (raw)
In-Reply-To: <CALAqxLVgwmfwkmhHD8dVA-g6iGG-uz3sy0n4cA+tSS0AAaT6YQ@mail.gmail.com>
On Wed, Dec 2, 2015 at 3:42 PM, John Stultz <john.stultz@linaro.org> wrote:
> On Wed, Dec 2, 2015 at 3:38 PM, John Stultz <john.stultz@linaro.org> wrote:
>> On Wed, Dec 2, 2015 at 3:25 PM, Andy Lutomirski <luto@kernel.org> wrote:
>>> In case it's at all useful, adjtimex -p says:
>>>
>>> mode: 0
>>> offset: 0
>>> frequency: 135641
>>> maxerror: 37498
>>> esterror: 1532
>>> status: 8192
>>> time_constant: 2
>>> precision: 1
>>> tolerance: 32768000
>>> tick: 10000
>>> raw time: 1449098317s 671243180us = 1449098317.671243180
>>>
>>> this suggests a rather small correction, so I really have no idea what
>>> "Adjusting tsc more than 11% (8039115 vs 7759462)" means.
>>>
>>> John, you wrote this code. What does the error message mean?
>
> Also, is there a behavior issue you're seeing or is this just a
> concern about the warning? I assumed it was the first, but digging up
> the thread here I'm not sure I see any specific problems listed.
No, there's no actual problem I'm aware of other than the error
message. Skylake's TSC is different from other chips, and this is
Skylake, and I was worried that something was wrong with the initial
calibration. It seems like the initial calibration may be fine,
though.
--Andy
next prev parent reply other threads:[~2015-12-02 23:59 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-02 20:06 Skylake (XPS 13 9350) TSC is way off Andy Lutomirski
2015-12-02 22:52 ` Brown, Len
2015-12-02 23:25 ` Andy Lutomirski
2015-12-02 23:38 ` John Stultz
2015-12-02 23:42 ` Andy Lutomirski
2015-12-02 23:55 ` John Stultz
2015-12-21 8:10 ` Jon Masters
2015-12-21 21:56 ` John Stultz
2015-12-02 23:42 ` John Stultz
2015-12-02 23:59 ` Andy Lutomirski [this message]
2015-12-03 3:25 ` Brown, Len
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