Re: TSC problems with Acer TravelMate 5735Z

From: Thomas Gleixner
Date: Thu May 28 2020 - 08:06:35 EST

Peter Zijlstra <peterz@xxxxxxxxxxxxx> 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.