From: Arjan Koers <0h61vkll2ly8@xutrox.com>
To: kvm@vger.kernel.org
Cc: Zachary Amsden <zamsden@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
Michael Tokarev <mjt@tls.msk.ru>, Avi Kivity <avi@redhat.com>,
Glauber Costa <glommer@redhat.com>,
Andre Przywara <andre.przywara@amd.com>
Subject: Re: 2.6.35-rc1 regression with pvclock and smp guests
Date: Fri, 08 Oct 2010 02:12:51 +0200 [thread overview]
Message-ID: <4CAE6203.6040902@xutrox.com> (raw)
In-Reply-To: <4CA7C34C.4040000@redhat.com>
On 2010-10-03 01:42, Zachary Amsden wrote:
...
>
> Umm... do you guys have this commit? This is supposed to address the
> issue where the guest keeps resetting the TSC. A guest which does that
> will break kvmclock. It only happens on SMP, and it's much worse on AMD
> CPUs...
>
> sound like your scenario.
>
> commit bd59fc8ff95126f27b7a0df1b6cc602aa428812d
> Author: Zachary Amsden <zamsden@redhat.com>
> Date: Thu Aug 19 22:07:26 2010 -1000
This commit fixes the problem:
commit aad07c4f92bae2edaa42bcef84c2afdd0d082458
Author: Zachary Amsden <zamsden@redhat.com>
Date: Thu Aug 19 22:07:19 2010 -1000
KVM: x86: Move TSC reset out of vmcb_init
The VMCB is reset whenever we receive a startup IPI, so Linux is setting
TSC back to zero happens very late in the boot process and destabilizing
the TSC. Instead, just set TSC to zero once at VCPU creation time.
Why the separate patch? So git-bisect is your friend.
next prev parent reply other threads:[~2010-10-08 0:12 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-22 12:53 2.6.35-rc1 regression with pvclock and smp guests Andre Przywara
2010-07-25 8:44 ` Avi Kivity
2010-07-26 8:47 ` Andre Przywara
2010-07-26 18:59 ` Arjan Koers
2010-07-27 21:00 ` Arjan Koers
2010-07-28 10:37 ` Avi Kivity
2010-07-31 0:34 ` Arjan Koers
2010-07-31 1:38 ` Zachary Amsden
2010-07-31 11:50 ` Arjan Koers
2010-07-31 2:39 ` Zachary Amsden
2010-07-31 11:53 ` Arjan Koers
2010-07-31 16:36 ` Arjan Koers
2010-07-31 19:45 ` Arjan Koers
2010-07-31 23:55 ` Zachary Amsden
2010-08-02 14:43 ` Glauber Costa
2010-08-02 16:16 ` Arjan Koers
2010-08-02 18:07 ` Glauber Costa
2010-08-02 20:26 ` Zachary Amsden
2010-08-02 21:10 ` Glauber Costa
2010-08-02 21:35 ` Arjan Koers
2010-08-03 0:00 ` Zachary Amsden
2010-09-28 11:16 ` Michael Tokarev
2010-09-29 8:12 ` Michael Tokarev
2010-09-29 8:28 ` Avi Kivity
2010-09-29 9:17 ` Michael Tokarev
2010-09-29 9:19 ` Michael Tokarev
2010-09-29 19:26 ` Arjan Koers
2010-09-30 7:55 ` Michael Tokarev
2010-09-30 9:59 ` Michael Tokarev
2010-09-30 13:54 ` Zachary Amsden
2010-09-30 15:12 ` Michael Tokarev
2010-09-30 15:32 ` Zachary Amsden
2010-09-30 18:49 ` Arjan Koers
2010-09-30 19:05 ` Marcelo Tosatti
2010-09-30 20:16 ` Arjan Koers
2010-09-30 23:02 ` Michael Tokarev
2010-09-30 23:07 ` Michael Tokarev
2010-10-01 1:13 ` Zachary Amsden
2010-10-02 5:35 ` Zachary Amsden
2010-10-02 7:35 ` Michael Tokarev
2010-10-02 7:40 ` Michael Tokarev
2010-10-02 7:50 ` Michael Tokarev
2010-10-02 16:10 ` Arjan Koers
2010-10-02 20:26 ` Michael Tokarev
2010-10-02 23:42 ` Zachary Amsden
2010-10-03 8:27 ` Michael Tokarev
2010-10-08 0:12 ` Arjan Koers [this message]
2010-10-08 2:47 ` Zachary Amsden
2010-10-08 22:06 ` Marcelo Tosatti
2010-10-09 1:10 ` Arjan Koers
2010-10-09 2:27 ` Zachary Amsden
2010-10-09 6:29 ` Michael Tokarev
2010-10-09 8:59 ` Arjan Koers
2010-10-11 20:47 ` Zachary Amsden
2010-10-13 12:18 ` Glauber Costa
2010-10-10 1:20 ` Arjan Koers
2010-10-11 17:53 ` Anthony Liguori
2010-10-11 18:36 ` Marcelo Tosatti
2010-10-09 2:29 ` Zachary Amsden
2010-10-10 1:26 ` Arjan Koers
2010-10-20 20:47 ` Arjan Koers
2010-10-09 7:59 ` Michael Tokarev
2010-10-09 8:31 ` Michael Tokarev
2010-10-02 21:55 ` Zachary Amsden
2010-10-03 8:16 ` Michael Tokarev
2010-10-03 8:22 ` Avi Kivity
2010-10-03 8:30 ` Michael Tokarev
2010-07-27 10:03 ` Avi Kivity
2010-07-27 11:49 ` Andre Przywara
2010-07-27 12:06 ` Avi Kivity
2010-07-27 12:21 ` Andre Przywara
2010-07-27 12:34 ` Avi Kivity
2010-07-27 13:48 ` Andre Przywara
2010-07-27 13:58 ` Avi Kivity
2010-07-27 14:55 ` Andre Przywara
2010-07-27 21:51 ` Andre Przywara
2010-07-28 3:00 ` Zachary Amsden
2010-07-28 7:55 ` Andre Przywara
2010-07-28 12:25 ` Andre Przywara
2010-07-30 22:54 ` Zachary Amsden
2010-08-02 10:12 ` Andre Przywara
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