From: Marcelo Tosatti <mtosatti@redhat.com>
To: Eduardo Habkost <ehabkost@redhat.com>
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: invtsc + migration + TSC scaling
Date: Mon, 17 Oct 2016 21:58:49 -0200 [thread overview]
Message-ID: <20161017235846.GA22657@amt.cnet> (raw)
In-Reply-To: <20161017211101.GD3275@thinpad.lan.raisama.net>
On Mon, Oct 17, 2016 at 07:11:01PM -0200, Eduardo Habkost wrote:
> On Mon, Oct 17, 2016 at 06:24:38PM +0200, Paolo Bonzini wrote:
> > On 17/10/2016 16:50, Radim Krčmář wrote:
> > > 2016-10-17 07:47-0200, Marcelo Tosatti:
> [...]
> > >> since Linux guests use kvmclock and Windows guests use Hyper-V
> > >> enlightenment, it should be fine to disable 2).
> >
> > ... and 1 too.
> >
> > We should also blacklist the TSC deadline timer when invtsc is not
> > available.
Actually, a nicer fix would be to check the different
frequencies and scale the deadline relative to the difference.
This would take care of both patched and non-patched guests.
On a related note, what was the goal of Radim's paravirtual deadline
TSC timer?
> You mean on the guest-side? On the host side, it would make
> existing VMs refuse to run.
>
> --
> Eduardo
WARNING: multiple messages have this Message-ID (diff)
From: Marcelo Tosatti <mtosatti@redhat.com>
To: Eduardo Habkost <ehabkost@redhat.com>
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
qemu-devel@nongnu.org, kvm@vger.kernel.org
Subject: Re: [Qemu-devel] invtsc + migration + TSC scaling
Date: Mon, 17 Oct 2016 21:58:49 -0200 [thread overview]
Message-ID: <20161017235846.GA22657@amt.cnet> (raw)
In-Reply-To: <20161017211101.GD3275@thinpad.lan.raisama.net>
On Mon, Oct 17, 2016 at 07:11:01PM -0200, Eduardo Habkost wrote:
> On Mon, Oct 17, 2016 at 06:24:38PM +0200, Paolo Bonzini wrote:
> > On 17/10/2016 16:50, Radim Krčmář wrote:
> > > 2016-10-17 07:47-0200, Marcelo Tosatti:
> [...]
> > >> since Linux guests use kvmclock and Windows guests use Hyper-V
> > >> enlightenment, it should be fine to disable 2).
> >
> > ... and 1 too.
> >
> > We should also blacklist the TSC deadline timer when invtsc is not
> > available.
Actually, a nicer fix would be to check the different
frequencies and scale the deadline relative to the difference.
This would take care of both patched and non-patched guests.
On a related note, what was the goal of Radim's paravirtual deadline
TSC timer?
> You mean on the guest-side? On the host side, it would make
> existing VMs refuse to run.
>
> --
> Eduardo
next prev parent reply other threads:[~2016-10-17 23:59 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-14 21:20 invtsc + migration + TSC scaling Eduardo Habkost
2016-10-14 21:20 ` [Qemu-devel] " Eduardo Habkost
2016-10-17 9:47 ` Marcelo Tosatti
2016-10-17 9:47 ` [Qemu-devel] " Marcelo Tosatti
2016-10-17 14:50 ` Radim Krčmář
2016-10-17 14:50 ` [Qemu-devel] " Radim Krčmář
2016-10-17 16:24 ` Paolo Bonzini
2016-10-17 16:24 ` [Qemu-devel] " Paolo Bonzini
2016-10-17 21:11 ` Eduardo Habkost
2016-10-17 21:11 ` [Qemu-devel] " Eduardo Habkost
2016-10-17 23:58 ` Marcelo Tosatti [this message]
2016-10-17 23:58 ` Marcelo Tosatti
2016-10-18 13:41 ` Paolo Bonzini
2016-10-18 13:41 ` [Qemu-devel] " Paolo Bonzini
2016-10-18 17:09 ` Marcelo Tosatti
2016-10-18 17:09 ` [Qemu-devel] " Marcelo Tosatti
2016-10-18 20:52 ` Radim Krčmář
2016-10-18 20:52 ` [Qemu-devel] " Radim Krčmář
2016-10-18 21:05 ` Eduardo Habkost
2016-10-18 21:05 ` [Qemu-devel] " Eduardo Habkost
2016-10-19 13:27 ` Radim Krčmář
2016-10-19 13:27 ` [Qemu-devel] " Radim Krčmář
2016-10-19 13:55 ` Eduardo Habkost
2016-10-19 13:55 ` [Qemu-devel] " Eduardo Habkost
2016-10-19 15:42 ` Radim Krčmář
2016-10-19 15:42 ` [Qemu-devel] " Radim Krčmář
2016-10-19 17:42 ` Eduardo Habkost
2016-10-19 17:42 ` [Qemu-devel] " Eduardo Habkost
2016-10-18 13:48 ` Radim Krčmář
2016-10-18 13:48 ` [Qemu-devel] " Radim Krčmář
2016-10-18 13:36 ` Radim Krčmář
2016-10-18 13:36 ` [Qemu-devel] " Radim Krčmář
2016-10-18 13:38 ` Radim Krčmář
2016-10-18 13:38 ` [Qemu-devel] " Radim Krčmář
2016-10-17 17:20 ` Marcelo Tosatti
2016-10-17 17:20 ` [Qemu-devel] " Marcelo Tosatti
2016-10-18 13:27 ` Radim Krčmář
2016-10-18 13:27 ` [Qemu-devel] " Radim Krčmář
2016-10-18 9:04 ` Dr. David Alan Gilbert
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