[Bug 256781] EC2 Nitro: TSC-low timecounter lags

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 30 Jun 2021 03:57:01 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256781

--- Comment #18 from Colin Percival <cperciva@FreeBSD.org> ---
Thanks for all the details.  After some investigation, it looks like there's a
specific issue with TSC on T3/T3A instances which affects the clock
calibration.

In the long term we should switch over to using the KVM pvclock (which won't
have this problem) but that code isn't in the tree yet; for 13.0 I don't think
there's any good solution.

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