[Qemu-devel] is x-data-plane considered "stable" ?

[Qemu-devel] is x-data-plane considered "stable" ?

[Scott Sullivan]

Can anyone tell me if in any QEMU release x-data-plane is considered "stable"?

If its unclear, I am referring to the feature introduced in QEMU 1.4 for high performance disk I/O called virtio-blk data plane.

http://blog.vmsplice.net/2013/03/new-in-qemu-14-high-performance-virtio.html

I've tried searching docs, but can't find any mention if its still considered experimental or not in the latest QEMU releases.

Re: [Qemu-devel] is x-data-plane considered "stable" ?

[Alexandre DERUMIER]

Hi,
x-data-plane syntax is deprecated (should be remove in qemu 2.2),

it's using now iothreads

http://comments.gmane.org/gmane.comp.emulators.qemu/279118

 qemu -object iothread,id=iothread0 \
       -drive if=none,id=drive0,file=test.qcow2,format=qcow2 \
       -device virtio-blk-pci,iothread=iothread0,drive=drive0


I don't now about the stability, but here what is working and I have tested:

-live migration
-resizing
-io throttling
-hotplugging

I think block jobs (mirror,backup,...) don't work yet.


it's working with virtio-blk and virtio-scsi support is coming for qemu 2.2

Regards,

alexandre

----- Mail original -----

De: "Scott Sullivan" <ssullivan@liquidweb.com>
À: qemu-devel@nongnu.org
Envoyé: Jeudi 2 Octobre 2014 17:20:55
Objet: [Qemu-devel] is x-data-plane considered "stable" ?

Can anyone tell me if in any QEMU release x-data-plane is considered "stable"?

If its unclear, I am referring to the feature introduced in QEMU 1.4 for high performance disk I/O called virtio-blk data plane.

http://blog.vmsplice.net/2013/03/new-in-qemu-14-high-performance-virtio.html

I've tried searching docs, but can't find any mention if its still considered experimental or not in the latest QEMU releases.

Re: [Qemu-devel] is x-data-plane considered "stable" ?

[Paolo Bonzini]

Il 03/10/2014 12:11, Alexandre DERUMIER ha scritto:
> I don't now about the stability, but here what is working and I have tested:
> 
> -live migration
> -resizing
> -io throttling
> -hotplugging
> 
> I think block jobs (mirror,backup,...) don't work yet.
> 
> 
> it's working with virtio-blk and virtio-scsi support is coming for qemu 2.2

virtio-scsi support will _not_ be stable in 2.2.  It will only be there
for developers, basically.

Paolo

Re: [Qemu-devel] is x-data-plane considered "stable" ?

[Scott Sullivan]

On 10/03/2014 09:40 AM, Paolo Bonzini wrote:
> Il 03/10/2014 12:11, Alexandre DERUMIER ha scritto:
>> I don't now about the stability, but here what is working and I have tested:
>>
>> -live migration
>> -resizing
>> -io throttling
>> -hotplugging
>>
>> I think block jobs (mirror,backup,...) don't work yet.
>>
>>
>> it's working with virtio-blk and virtio-scsi support is coming for qemu 2.2
> virtio-scsi support will _not_ be stable in 2.2.  It will only be there
> for developers, basically.
>
> Paolo

Thank you everyone, appreciated.

Re: [Qemu-devel] is x-data-plane considered "stable" ?

[Alexandre DERUMIER]

Hi Paolo,

do you you think it'll be possible to use block jobs with dataplane ?

Or is it technically impossible ?


----- Mail original -----

De: "Paolo Bonzini" <pbonzini@redhat.com>
À: "Alexandre DERUMIER" <aderumier@odiso.com>, "Scott Sullivan" <ssullivan@liquidweb.com>
Cc: qemu-devel@nongnu.org
Envoyé: Vendredi 3 Octobre 2014 15:40:59
Objet: Re: is x-data-plane considered "stable" ?

Il 03/10/2014 12:11, Alexandre DERUMIER ha scritto:
> I don't now about the stability, but here what is working and I have tested:
>
> -live migration
> -resizing
> -io throttling
> -hotplugging
>
> I think block jobs (mirror,backup,...) don't work yet.
>
>
> it's working with virtio-blk and virtio-scsi support is coming for qemu 2.2

virtio-scsi support will _not_ be stable in 2.2. It will only be there
for developers, basically.

Paolo

Re: [Qemu-devel] is x-data-plane considered "stable" ?

[Paolo Bonzini]

Il 03/10/2014 16:26, Alexandre DERUMIER ha scritto:
> Hi Paolo,
> 
> do you you think it'll be possible to use block jobs with dataplane ?
> 
> Or is it technically impossible ?

I think Stefan has posted patches for that or is going to do that very soon.

The goal is to let dataplane do everything that is possible without it,
at the same speed of QEMU 2.0 dataplane (right now it's a bit slower,
but can already do much more of course).  Same for virtio-scsi.

Paolo

Re: [Qemu-devel] is x-data-plane considered "stable" ?

[Alexandre DERUMIER]

Ok, Great :)

Thanks !

----- Mail original -----

De: "Paolo Bonzini" <pbonzini@redhat.com>
À: "Alexandre DERUMIER" <aderumier@odiso.com>
Cc: qemu-devel@nongnu.org, "Scott Sullivan" <ssullivan@liquidweb.com>
Envoyé: Vendredi 3 Octobre 2014 17:33:00
Objet: Re: is x-data-plane considered "stable" ?

Il 03/10/2014 16:26, Alexandre DERUMIER ha scritto:
> Hi Paolo,
>
> do you you think it'll be possible to use block jobs with dataplane ?
>
> Or is it technically impossible ?

I think Stefan has posted patches for that or is going to do that very soon.

The goal is to let dataplane do everything that is possible without it,
at the same speed of QEMU 2.0 dataplane (right now it's a bit slower,
but can already do much more of course). Same for virtio-scsi.

Paolo

Re: [Qemu-devel] is x-data-plane considered "stable" ?

[Stefan Hajnoczi]

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On Fri, Oct 03, 2014 at 05:33:00PM +0200, Paolo Bonzini wrote:
> Il 03/10/2014 16:26, Alexandre DERUMIER ha scritto:
> > Hi Paolo,
> > 
> > do you you think it'll be possible to use block jobs with dataplane ?
> > 
> > Or is it technically impossible ?
> 
> I think Stefan has posted patches for that or is going to do that very soon.

Yes, in 2.2 virtio-blk dataplane will support blockjobs.  The patches
were sent to the list on Wednesday:

  [PATCH 00/11] block: allow blockjobs to coexist with dataplane

Stefan

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