From: Zachary Amsden <zamsden@redhat.com>
To: Lucas Meneghel Rodrigues <lmr@redhat.com>
Cc: KVM mailing list <kvm@vger.kernel.org>
Subject: Re: TSC host kernel message with kvm.git as host kernel and qemu-kvm.git as userspace
Date: Thu, 21 Oct 2010 10:56:18 -1000 [thread overview]
Message-ID: <4CC0A8F2.1050501@redhat.com> (raw)
In-Reply-To: <1287690549.3125.27.camel@freedom>
On 10/21/2010 09:49 AM, Lucas Meneghel Rodrigues wrote:
> Hi folks,
>
> I was doing some work at one of our host machines, the one that runs
> upstream (Fedora 14, kvm.git as the kernel and qemu-kvm.git as
> userspace), and I noticed the kernel message:
>
> kvm: unreliable cycle conversion on adjustable rate TSC
> kvm: SMP vm created on host with unstable TSC: guest TSC will not be
> reliable
>
Yes, the message is a warning; without TSC trapping, SMP VMs will have
unreliable TSC. In this case, you are advised to use kvmclock or
another non-TSC clocksource in the guest.
Zach
prev parent reply other threads:[~2010-10-21 20:56 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-21 19:49 TSC host kernel message with kvm.git as host kernel and qemu-kvm.git as userspace Lucas Meneghel Rodrigues
2010-10-21 20:56 ` Zachary Amsden [this message]
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