From: Bernhard Schmidt <berni@birkenwald.de>
To: Zachary Amsden <zamsden@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: Clock jumps
Date: Fri, 28 May 2010 00:12:10 +0200 [thread overview]
Message-ID: <4BFEEE3A.1010403@birkenwald.de> (raw)
In-Reply-To: <4BFEE9F3.8040200@redhat.com>
On 27.05.2010 23:53, Zachary Amsden wrote:
Hello Zachary,
> I have server side fixes for this kvm-clock which seem to give me a
> stable clock on this machine, but for true SMP stability, you will need
> Glauber's guest side changes to kvmclock as well. It is impossible to
> guarantee strictly monotonic clocksource across multiple CPUs when
> frequency is dynamically changing (and also because of the C1E idle
> problems).
Is all this relevant only when the host is on TSC? Because I have seen
these jumps when the host was on HPET and the guests were using kvm-clock.
Anyway, can you send me both patches? I'd like to try it, but I have
completely lost track where the up-to-date patches are.
Bernhard
next prev parent reply other threads:[~2010-05-27 22:12 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <loom.20100524T171038-56@post.gmane.org>
2010-05-25 6:21 ` Clock jumps Gleb Natapov
2010-05-26 17:10 ` Orion Poplawski
2010-05-26 17:31 ` Alexander Graf
2010-05-26 17:50 ` Orion Poplawski
2010-05-26 22:55 ` Orion Poplawski
2010-05-27 18:32 ` Bernhard Schmidt
2010-05-27 19:08 ` john stultz
2010-05-27 21:48 ` Bernhard Schmidt
2010-05-28 0:00 ` john stultz
2010-05-28 0:33 ` Bernhard Schmidt
2010-05-28 0:46 ` john stultz
2010-05-27 21:53 ` Zachary Amsden
2010-05-27 22:12 ` Bernhard Schmidt [this message]
2010-05-27 22:20 ` Zachary Amsden
2010-05-27 22:22 ` Zachary Amsden
2010-06-02 22:54 ` Orion Poplawski
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