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Date:      Tue, 10 Mar 2020 16:38:33 +1100
From:      Peter Jeremy <peter@rulingia.com>
To:        Theron <theron.tarigo@gmail.com>
Cc:        FreeBSD Current <freebsd-current@freebsd.org>
Subject:   Re: System clock is slow
Message-ID:  <20200310053833.GD3091@server.rulingia.com>
In-Reply-To: <989cd36a-e015-940a-dfe2-851c6fdf4734@gmail.com>
References:  <989cd36a-e015-940a-dfe2-851c6fdf4734@gmail.com>

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On 2020-Mar-09 19:59:09 -0400, Theron <theron.tarigo@gmail.com> wrote:
>Since switching from 12.1-RELEASE to CURRENT I've noticed timing=20
>problems with audio applications.=A0 It turns out that the problem is not=
=20
>with the audio drivers, but with the system clock driver, which now=20
>reports passage of time 0.3% too slow.=A0 Although I discovered this only=
=20
>recently, it's been broken since r352684 made on Sept. 25.=A0 Has anyone=
=20
>else noticed?

Note that r352684 was MFC'd to both 11-stable (r353007) and 12-stable
(r353006) in early October and I don't recall seeing any adverse
reports before this.

Are you running NTP?  If so, is NTP maintaining lock and what is the
reported PLL frequency (ntpq -c kerni)?

What does "sysctl kern.timecounter" report and have you tried using
any of the alternative timecounters listed in kern.timecounter.choice?

Are you overclocking your CPU (or doing anything else non-standard)?

--=20
Peter Jeremy

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