linux-kernel - Re: tsc: Fast TSC calibration failed with AMD B350M/Ryzen 3 2200G

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Date:   Mon, 7 Jan 2019 16:24:26 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Paul Menzel <pmenzel@...gen.mpg.de>
cc:     x86@...nel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: tsc: Fast TSC calibration failed with AMD B350M/Ryzen 3 2200G

Paul,

On Mon, 31 Dec 2018, Paul Menzel wrote:

> Linux 4.19.13 from Debian Sid/unstable logs the message below on the board MSI
> MS-7A37/B350M MORTAR with the processor AMD Ryzen 3 2200G.
> 
> As a result, the early time stamps do not seem to be working.

> > [    0.000000] DMI: Micro-Star International Co., Ltd. MS-7A37/B350M MORTAR
> > (MS-7A37), BIOS 1.I0 11/06/2018
> > [    0.000000] tsc: Fast TSC calibration failed

And the further boot log says:

[    0.036000] tsc: Unable to calibrate against PIT
[    0.036000] tsc: using HPET reference calibration
[    0.036000] tsc: Detected 3500.117 MHz processor

So the quick calibration in early boot fails because the PIT seems not to
do what the kernel expects. Nothing we can cure :(

Thanks,

	tglx