linux-kernel - Re: TSC problems with Acer TravelMate 5735Z

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Message-ID: <874ks0p8li.fsf@nanos.tec.linutronix.de>
Date:   Thu, 28 May 2020 14:06:17 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Peter Zijlstra <peterz@...radead.org>,
        Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     x86@...nel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: TSC problems with Acer TravelMate 5735Z

Peter Zijlstra <peterz@...radead.org> writes:
> On Sun, May 24, 2020 at 07:09:18PM +0200, Paul Menzel wrote:
>> Dear Linux folks,
>> 
>> 
>> I got my hands on an old Acer TravelMate 5735Z (Intel GM45/Cantiga) and
>> installed Debian Sid/unstable with Linux 5.6.7 on it.
>> 
>> Booting the system it takes a long time, and the systemd units fail to
>> start. The logs contain that the TSC is unstable. Adding `tsc=unstable` to
>> the Linux kernel command line fixes this.
>
> It fixes nothing; it just doesn't get you the warning because you told
> it upfront.

Well, it prevents the kernel to use TSC upfront and not wait until it's
discovered to be crap. That might make a difference.

Thanks,

        tglx