From: Zachary Amsden <zamsden@redhat.com>
To: Arjan Koers <0h61vkll2ly8@xutrox.com>
Cc: kvm@vger.kernel.org, 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: Thu, 07 Oct 2010 16:47:11 -1000 [thread overview]
Message-ID: <4CAE862F.10904@redhat.com> (raw)
In-Reply-To: <4CAE6203.6040902@xutrox.com>
On 10/07/2010 02:12 PM, Arjan Koers wrote:
> 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.
>
Okay, apparently I need to go poke around 2.6.35 and see what patches
made it there and what patches didn't.
next prev parent reply other threads:[~2010-10-08 2:47 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
2010-10-08 2:47 ` Zachary Amsden [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4CAE862F.10904@redhat.com \
--to=zamsden@redhat.com \
--cc=0h61vkll2ly8@xutrox.com \
--cc=andre.przywara@amd.com \
--cc=avi@redhat.com \
--cc=glommer@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=mjt@tls.msk.ru \
--cc=mtosatti@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox