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Re: kern/56322: Excessive clock drift
The following reply was made to PR kern/56322; it has been noted by GNATS.
From: Frank Kardel <kardel%kardel.name@localhost>
Subject: Re: kern/56322: Excessive clock drift
Date: Thu, 22 Jul 2021 10:10:51 +0200
On 07/22/21 09:00, David Holland wrote:
> > Can you try
> > sysctl -w kern.timecounter.hardware=i8254
> > and see whether that improves the situation.
> As of ~now when I did that it had dropped to two full minutes behind,
> in something like seven hours, so tomorrow morning should indicate
> whether the situation's better.
120s / 25200 sec ~ 0.0048 = 4800ppm
Something must be really wrong with TSC frequency estimation or
stability on that system.
Also I would have expected a timecounter like hpet. Could that be
disabled in the BIOS?
> David A. Holland
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