[pve-devel] Virtio--Blk-Data-Plane deliver much higher I/O rates than both of its major competing hypervisors

[Stefan Priebe - Profihost AG]

Am 06.02.2014 09:20, schrieb Alexandre DERUMIER:
>>> A that was the culprit. Something without live migration isn't usable at 
>>> least to me. 
> 
> Just found that :)
> 
> dataplane: enable virtio-blk x-data-plane=on live migration
> 
> http://git.qemu.org/?p=qemu.git;a=commit;h=84db52d059f3296abf7783968645c4a96d21b099
> 
> 
> So maybe it's possible now :)

Yes so dataplane is disabled while live migration but you still can't
use I/O throttling so PVE would need to disable this if dataplane is on.

Also "Image formats are not supported (qcow2, qed, etc).", Hot unplug is
not supported. Block jobs (block-stream, drive-mirror, block-commit) are
not supported.

So this would add so may exceptions to pve... i don't thing anybody
wants that.

Stefan


> 
> ----- Mail original ----- 
> 
> De: "Stefan Priebe - Profihost AG" <s.priebe at profihost.ag> 
> À: "Alexandre DERUMIER" <aderumier at odiso.com> 
> Cc: "Cesar Peschiera" <brain at click.com.py>, pve-devel at pve.proxmox.com 
> Envoyé: Jeudi 6 Février 2014 09:15:10 
> Objet: Re: [pve-devel] Virtio--Blk-Data-Plane deliver much higher I/O rates than both of its major competing hypervisors 
> 
> Hi, 
> Am 06.02.2014 09:12, schrieb Alexandre DERUMIER: 
>>>> If i remember correctly there were some reasons why it is not available 
>>>> in PVE right now. 
>>
>> I think they are no technical objection and not to difficult to implement. (I need to read the qemu doc) 
>>
>> (But live-migration don't work with Virtio--Blk-Data-Plane) 
> 
> A that was the culprit. Something without live migration isn't usable at 
> least to me. 
> 
> Stefan 
> 
> 
>> ----- Mail original ----- 
>>
>> De: "Stefan Priebe - Profihost AG" <s.priebe at profihost.ag> 
>> À: "Cesar Peschiera" <brain at click.com.py>, pve-devel at pve.proxmox.com 
>> Envoyé: Jeudi 6 Février 2014 08:37:49 
>> Objet: Re: [pve-devel] Virtio--Blk-Data-Plane deliver much higher I/O rates than both of its major competing hypervisors 
>>
>> Yes that's why i'm always staring at Virtio--Blk-Data-Plane but isn't 
>> it unstable right now and has a lot of missing features? 
>>
>> If i remember correctly there were some reasons why it is not available 
>> in PVE right now. 
>>
>> Stefan 
>>
>> Am 06.02.2014 08:11, schrieb Cesar Peschiera: 
>>> Hi people 
>>>
>>> Only as comment for you (if you don't know it), I bring a link PDF of IBM 
>>> that say between many things: 
>>>
>>> KVM with Virtio--Blk-Data-Plane deliver much higher I/O rates than both 
>>> of its major competing hypervisors 
>>>
>>> KVM with virtio-blk technology could achieve only about 150,000 I/O 
>>> operations per second for a single guest 
>>>
>>> KVM with Virtio--Blk-Data-Plane: (Technology Preview in RHEL 6.4) more than 
>>> 1.5 million IOPS for random I/O requests that were 4KB or less 
>>> - 49% higher than VMware vSphere 5.1 
>>> - The highest storage I/O performance ever reported in a virtualized 
>>> environment 
>>>
>>> VMware vSphere 5.1: recently indicated that it could achieve almost 1.1 
>>> million IOPS 
>>>
>>> In addition, KVM with virtio-blk-data-plane technology can achieve much 
>>> higher I/O rates than what Microsoft has claimed for its Hyper-V hypervisor 
>>> across multiple block sizes 
>>>
>>> ftp://public.dhe.ibm.com/linux/pdfs/KVM_Virtualized_IO_Performance_Paper_v2.pdf 
>>>
>>>
>>> Best regards 
>>> Cesar 
>>>
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