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

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From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 30 Jun 2021 17:42:34 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256781

--- Comment #20 from Colin Percival <cperciva@FreeBSD.org> ---
(In reply to Roger Pau Monné from comment #19)

> So this system reports invariant TSC, but the TSCs are not synchronized across CPUs?

My understanding is that it's even worse than that: The TSC is not synchronized
across a *single* CPU, since we're a VM guest and what we see as a single CPU
might move between host CPUs which aren't synchronized.

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