From: Paolo Bonzini <pbonzini@redhat.com>
To: Andy Lutomirski <luto@amacapital.net>,
Marcelo Tosatti <mtosatti@redhat.com>
Cc: kvm list <kvm@vger.kernel.org>, Radim Krcmar <rkrcmar@redhat.com>,
X86 ML <x86@kernel.org>
Subject: Re: kvmclock doesn't work, help?
Date: Tue, 15 Dec 2015 09:42:04 +0100 [thread overview]
Message-ID: <566FD25C.5040806@redhat.com> (raw)
In-Reply-To: <CALCETrULJW9BpB+VQOFvLYOYrA0xBWwgzim3kRB+FzZe6Voa+g@mail.gmail.com>
On 14/12/2015 23:31, Andy Lutomirski wrote:
> > RAW TSC NTP corrected TSC
> > t0 10 10
> > t1 20 19.99
> > t2 30 29.98
> > t3 40 39.97
> > t4 50 49.96
> >
> > ...
> >
> > if you suddenly switch from RAW TSC to NTP corrected TSC,
> > you can see what will happen.
>
> Sure, but why would you ever switch from one to the other?
The guest uses the raw TSC and systemtime = 0 until suspend. After
resume, the TSC certainly increases at the same rate as before, but the
raw TSC restarted counting from 0 and systemtime has increased slower
than the guest kvmclock.
Paolo
> The only things that need to be monotonic are the output from
> vread_pvclock and the in-kernel equivalent, I think.
next prev parent reply other threads:[~2015-12-15 8:42 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-09 21:10 kvmclock doesn't work, help? Andy Lutomirski
2015-12-09 21:16 ` Paolo Bonzini
2015-12-09 21:49 ` Andy Lutomirski
2015-12-09 22:12 ` Paolo Bonzini
2015-12-09 22:27 ` Andy Lutomirski
2015-12-09 22:42 ` Paolo Bonzini
2015-12-09 22:43 ` Andy Lutomirski
2015-12-10 21:33 ` Marcelo Tosatti
2015-12-10 21:32 ` Marcelo Tosatti
2015-12-11 21:57 ` Andy Lutomirski
2015-12-11 23:48 ` Marcelo Tosatti
2015-12-14 18:07 ` Andy Lutomirski
2015-12-14 21:47 ` Marcelo Tosatti
2015-12-14 13:44 ` Paolo Bonzini
2015-12-14 22:00 ` Marcelo Tosatti
2015-12-14 22:31 ` Andy Lutomirski
2015-12-14 22:38 ` Marcelo Tosatti
2015-12-15 8:42 ` Paolo Bonzini [this message]
2015-12-16 17:48 ` Andy Lutomirski
2015-12-16 18:17 ` Andy Lutomirski
2015-12-16 21:57 ` Marcelo Tosatti
2015-12-17 16:33 ` Andy Lutomirski
2015-12-17 19:08 ` Marcelo Tosatti
2015-12-18 1:12 ` Andy Lutomirski
2015-12-18 11:47 ` Marcelo Tosatti
2015-12-18 19:27 ` Andy Lutomirski
2015-12-18 19:45 ` Marcelo Tosatti
2015-12-18 20:25 ` Andy Lutomirski
2015-12-18 21:49 ` Marcelo Tosatti
2015-12-21 22:49 ` Andy Lutomirski
2015-12-23 19:27 ` Marcelo Tosatti
2015-12-23 23:09 ` Andy Lutomirski
2015-12-19 1:16 ` John Stultz
2015-12-10 21:36 ` Marcelo Tosatti
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