linux-kernel - Re: Regression: can't apply frequency offsets above 1000ppm.

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Date:	Wed, 2 Sep 2015 02:14:21 +0100
From:	Nuno Gonçalves <nunojpg@...il.com>
To:	John Stultz <john.stultz@...aro.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Miroslav Lichvar <mlichvar@...hat.com>, dl4mea@...oo.de,
	stable <stable@...r.kernel.org>
Subject: Re: Regression: can't apply frequency offsets above 1000ppm.

On Wed, Sep 2, 2015 at 2:03 AM, John Stultz <john.stultz@...aro.org> wrote:
> On Tue, Sep 1, 2015 at 5:36 PM, Nuno Gonçalves <nunojpg@...il.com> wrote:
>> On Tue, Sep 1, 2015 at 9:25 PM, Thomas Gleixner <tglx@...utronix.de> wrote:
>>> On Tue, 1 Sep 2015, Nuno Gonçalves wrote:
>>>
>>>> There is a regression on the clock system since v3.16-rc5-111-g4396e05
>>>> [1],
>>>
>>>> [1] http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4396e058c52e167729729cf64ea3dfa229637086
>>>
>>> That commit has absolutely nothing to do with NTP. I fear your bisect
>>> went down the wrong road somewhere.
>>
>> You are right. It is v3.16-rc5-114-gdc49159:
>>
>> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=dc491596f6394382fbc74ad331156207d619fa0a
>>
>> I've triple checked it this time. Not sure where I did the mistake to
>> get it wrong by 3 commits.
>
> This commit is much more believable (though surprising as that change
> was found to greatly improve results for most uses).
>
> Can you provide any more details about how the problem is reproduced
> (kernel config, what userland images are you using, etc)?  I've got a
> BBB myself so I can try to see whats going on.
>
> thanks
> -john

I'm using a clean Debian image:

https://rcn-ee.com/rootfs/bb.org/testing/2015-08-31/console/bone-debian-8.1-console-armhf-2015-08-31-2gb.img.xz

And just installing chrony from the feeds. With any kernel from 3.17
you'll have wrong estimates at chronyc sourcestats.

Miroslav did some tests at a beaglebone I set for him, according to my
initial post.

Miroslav also dismissed this being related to nohz after some tests.

Thanks,
Nuno
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