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Date:      Wed, 30 Jun 2021 17:42:34 +0000
From:      bugzilla-noreply@freebsd.org
To:        virtualization@FreeBSD.org
Subject:   [Bug 256781] EC2 Nitro: TSC-low timecounter lags
Message-ID:  <bug-256781-27103-KC2asXYdNj@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-256781-27103@https.bugs.freebsd.org/bugzilla/>
References:  <bug-256781-27103@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D256781

--- Comment #20 from Colin Percival <cperciva@FreeBSD.org> ---
(In reply to Roger Pau Monn=C3=A9 from comment #19)

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

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

--=20
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