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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: David Holland <>
Subject: Re: kern/56322: Excessive clock drift
Date: Thu, 22 Jul 2021 23:29:25 +0000

 On Thu, Jul 22, 2021 at 07:00:03AM +0000, David Holland wrote:
  >   >  Can you try
  >   >  
  >   >  sysctl -w kern.timecounter.hardware=i8254
  >   >  
  >   >  and see whether that improves the situation.
  >  Yes.
  >  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.
 Drift since then has been ~0, so the issue reduces to: why are we no
 longer detecting that the TSC is bad?
 David A. Holland

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