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Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the ho
From: |
Anthony Liguori |
Subject: |
Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it |
Date: |
Mon, 01 Oct 2012 14:03:54 -0500 |
User-agent: |
Notmuch/0.13.2+93~ged93d79 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-pc-linux-gnu) |
"Daniel P. Berrange" <address@hidden> writes:
> On Mon, Oct 01, 2012 at 06:43:00PM +0200, Andreas Färber wrote:
>> Hello Jan,
>>
>> Am 01.10.2012 16:34, schrieb Jan Kiszka:
>> > If we built a target for a host that supports KVM in principle, set the
>> > default accelerator to KVM as well. This also means the start of QEMU
>> > will fail to start if KVM support turns out to be unavailable at
>> > runtime.
>>
>> From a distro point of view this of course means that we will build
>> against KVM and that the new KVM default will start to fail for users on
>> very old hardware. Can't we do a runtime check to select the default?
>
> NB, this is *not* only about old hardware. There are plenty of users who
> use QEMU inside VMs. One very common usage I know of is image building
> tools which are run inside Amazon VMs, using libguestfs & QEMU.
But libguest can set it's accelerator option to whatever it wants.
If your running QEMU under a VM, it's pretty reasonable to have to use a
special option IMHO.
> IMHO, default to KVM, fallback to TCG is the most friendly default
> behaviour.
Except if a user expects good network performance and can't
understand why they're getting 100kb/s.
Regards,
Anthony Liguori
>
> Daniel
> --
> |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :|
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- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, (continued)
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, Blue Swirl, 2012/10/03
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, Peter Maydell, 2012/10/03
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, Alexander Graf, 2012/10/04
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, Anthony Liguori, 2012/10/04
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, Alexander Graf, 2012/10/04
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, Peter Maydell, 2012/10/05
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, Andreas Färber, 2012/10/08
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, Alexander Graf, 2012/10/08
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, Andreas Färber, 2012/10/01
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, Daniel P. Berrange, 2012/10/01
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it,
Anthony Liguori <=
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, Paolo Bonzini, 2012/10/01
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, Anthony Liguori, 2012/10/01
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, Markus Armbruster, 2012/10/02
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, Aurelien Jarno, 2012/10/02
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, Michael Tokarev, 2012/10/03
- Re: [Qemu-devel] [PATCH] kvm: Set default accelerator to "kvm" if the host supports it, Jan Kiszka, 2012/10/03
Re: [Qemu-devel] qemu-kvm: remove "boot=on|off" drive parameter compatibility, Alexander Graf, 2012/10/01
Re: [Qemu-devel] qemu-kvm: remove "boot=on|off" drive parameter compatibility, Bruce Rogers, 2012/10/01
Re: [Qemu-devel] qemu-kvm: remove "boot=on|off" drive parameter compatibility, Daniel P. Berrange, 2012/10/02