From: Juan Quintela <quintela@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: kvm@vger.kernel.org, qemu-devel <qemu-devel@nongnu.org>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Eduardo Habkost" <ehabkost@redhat.com>
Subject: Re: [QEMU PATCH v2] kvmclock: advance clock by time window between vm_stop and pre_save
Date: Fri, 04 Nov 2016 19:57:59 +0100 [thread overview]
Message-ID: <8760o3nkco.fsf@emacs.mitica> (raw)
In-Reply-To: <20161104165933.GA3027@amt.cnet> (Marcelo Tosatti's message of "Fri, 4 Nov 2016 14:59:36 -0200")
Marcelo Tosatti <mtosatti@redhat.com> wrote:
> This patch, relative to pre-copy migration codepath,
> measures the time between vm_stop() and pre_save(),
> which includes copying the remaining RAM to destination,
> and advances the clock by that amount.
>
> In a VM with 5 seconds downtime, this reduces the guest
> clock difference on destination from 5s to 0.2s.
>
> Tested with Linux and Windows 2012 R2 guests with -cpu XXX,+hv-time.
>
> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
>
> ---
>
> v2: use subsection (Juan Quintela)
> fix older machine types support
>
Reviewed-by: Juan Quintela <quintela@redhat.com>
WARNING: multiple messages have this Message-ID (diff)
From: Juan Quintela <quintela@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: kvm@vger.kernel.org, qemu-devel <qemu-devel@nongnu.org>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Eduardo Habkost" <ehabkost@redhat.com>
Subject: Re: [Qemu-devel] [QEMU PATCH v2] kvmclock: advance clock by time window between vm_stop and pre_save
Date: Fri, 04 Nov 2016 19:57:59 +0100 [thread overview]
Message-ID: <8760o3nkco.fsf@emacs.mitica> (raw)
In-Reply-To: <20161104165933.GA3027@amt.cnet> (Marcelo Tosatti's message of "Fri, 4 Nov 2016 14:59:36 -0200")
Marcelo Tosatti <mtosatti@redhat.com> wrote:
> This patch, relative to pre-copy migration codepath,
> measures the time between vm_stop() and pre_save(),
> which includes copying the remaining RAM to destination,
> and advances the clock by that amount.
>
> In a VM with 5 seconds downtime, this reduces the guest
> clock difference on destination from 5s to 0.2s.
>
> Tested with Linux and Windows 2012 R2 guests with -cpu XXX,+hv-time.
>
> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
>
> ---
>
> v2: use subsection (Juan Quintela)
> fix older machine types support
>
Reviewed-by: Juan Quintela <quintela@redhat.com>
next prev parent reply other threads:[~2016-11-04 18:58 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-04 9:43 [QEMU PATCH] kvmclock: advance clock by time window between vm_stop and pre_save Marcelo Tosatti
2016-11-04 9:43 ` [Qemu-devel] " Marcelo Tosatti
2016-11-04 12:28 ` Juan Quintela
2016-11-04 12:28 ` [Qemu-devel] " Juan Quintela
2016-11-04 12:35 ` Marcelo Tosatti
2016-11-04 12:35 ` [Qemu-devel] " Marcelo Tosatti
2016-11-04 14:00 ` Marcelo Tosatti
2016-11-04 14:00 ` [Qemu-devel] " Marcelo Tosatti
2016-11-04 15:25 ` Radim Krčmář
2016-11-04 15:25 ` [Qemu-devel] " Radim Krčmář
2016-11-04 15:33 ` Paolo Bonzini
2016-11-04 15:33 ` [Qemu-devel] " Paolo Bonzini
2016-11-04 15:48 ` Radim Krčmář
2016-11-04 15:48 ` [Qemu-devel] " Radim Krčmář
2016-11-04 15:57 ` Paolo Bonzini
2016-11-04 15:57 ` [Qemu-devel] " Paolo Bonzini
2016-11-04 17:16 ` Radim Krčmář
2016-11-04 17:16 ` [Qemu-devel] " Radim Krčmář
2016-11-04 21:29 ` Paolo Bonzini
2016-11-04 21:29 ` [Qemu-devel] " Paolo Bonzini
2016-11-04 21:47 ` Marcelo Tosatti
2016-11-04 21:47 ` [Qemu-devel] " Marcelo Tosatti
2016-11-04 22:35 ` Paolo Bonzini
2016-11-04 22:35 ` [Qemu-devel] " Paolo Bonzini
2016-11-07 14:31 ` Roman Kagan
2016-11-07 14:31 ` [Qemu-devel] " Roman Kagan
2016-11-07 19:31 ` Marcelo Tosatti
2016-11-07 19:31 ` [Qemu-devel] " Marcelo Tosatti
2016-11-04 16:24 ` Marcelo Tosatti
2016-11-04 16:24 ` [Qemu-devel] " Marcelo Tosatti
2016-11-04 17:34 ` Radim Krčmář
2016-11-04 17:34 ` [Qemu-devel] " Radim Krčmář
2016-11-04 18:29 ` Marcelo Tosatti
2016-11-04 18:29 ` [Qemu-devel] " Marcelo Tosatti
2016-11-04 20:07 ` Radim Krčmář
2016-11-04 20:07 ` [Qemu-devel] " Radim Krčmář
2016-11-04 16:04 ` Marcelo Tosatti
2016-11-04 16:04 ` [Qemu-devel] " Marcelo Tosatti
2016-11-04 17:07 ` Marcelo Tosatti
2016-11-04 17:07 ` [Qemu-devel] " Marcelo Tosatti
2016-11-04 17:39 ` Radim Krčmář
2016-11-04 17:39 ` [Qemu-devel] " Radim Krčmář
2016-11-04 18:31 ` Marcelo Tosatti
2016-11-04 18:31 ` [Qemu-devel] " Marcelo Tosatti
2016-11-07 13:08 ` Dr. David Alan Gilbert
2016-11-07 13:08 ` [Qemu-devel] " Dr. David Alan Gilbert
2016-11-04 16:59 ` [QEMU PATCH v2] " Marcelo Tosatti
2016-11-04 16:59 ` [Qemu-devel] " Marcelo Tosatti
2016-11-04 18:57 ` Juan Quintela [this message]
2016-11-04 18:57 ` Juan Quintela
2016-11-07 15:46 ` Dr. David Alan Gilbert
2016-11-07 15:46 ` [Qemu-devel] " Dr. David Alan Gilbert
2016-11-07 19:41 ` Marcelo Tosatti
2016-11-07 19:41 ` [Qemu-devel] " Marcelo Tosatti
2016-11-07 20:03 ` Dr. David Alan Gilbert
2016-11-07 20:03 ` [Qemu-devel] " Dr. David Alan Gilbert
2016-11-08 0:06 ` Marcelo Tosatti
2016-11-08 0:06 ` [Qemu-devel] " Marcelo Tosatti
2016-11-08 10:22 ` Dr. David Alan Gilbert
2016-11-08 10:22 ` [Qemu-devel] " Dr. David Alan Gilbert
2016-11-08 13:32 ` Marcelo Tosatti
2016-11-08 13:32 ` [Qemu-devel] " Marcelo Tosatti
2016-11-09 19:32 ` Marcelo Tosatti
2016-11-09 19:32 ` [Qemu-devel] " Marcelo Tosatti
2016-11-09 16:23 ` Paolo Bonzini
2016-11-09 16:23 ` [Qemu-devel] " Paolo Bonzini
2016-11-09 16:28 ` Dr. David Alan Gilbert
2016-11-09 16:28 ` [Qemu-devel] " Dr. David Alan Gilbert
2016-11-09 16:33 ` Paolo Bonzini
2016-11-09 16:33 ` [Qemu-devel] " Paolo Bonzini
2016-11-10 11:48 ` Marcelo Tosatti
2016-11-10 11:48 ` [Qemu-devel] " Marcelo Tosatti
2016-11-10 17:57 ` Paolo Bonzini
2016-11-10 17:57 ` [Qemu-devel] " Paolo Bonzini
2016-11-11 14:23 ` Marcelo Tosatti
2016-11-11 14:23 ` [Qemu-devel] " Marcelo Tosatti
2017-02-07 10:02 ` Wanpeng Li
2017-02-07 10:02 ` [Qemu-devel] " Wanpeng Li
2017-02-07 12:18 ` Marcelo Tosatti
2017-02-07 12:18 ` [Qemu-devel] " Marcelo Tosatti
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