Re: [Qemu-devel] slow speed for virtio-scsi since qemu 2.2

[Paolo Bonzini]

On 16/02/2015 15:43, Stefan Priebe - Profihost AG wrote:
> Hi,
> 
> Am 16.02.2015 um 13:24 schrieb Paolo Bonzini:
>>
>>
>> On 15/02/2015 19:46, Stefan Priebe wrote:
>>>
>>> while i get a constant random 4k i/o write speed of 20.000 iops with
>>> qemu 2.1.0 or 2.1.3. I get jumping speeds with qemu 2.2 (jumping between
>>> 500 iops and 15.000 iop/s).
>>>
>>> If i use virtio instead of virtio-scsi speed is the same between 2.2 and
>>> 2.1.
>>
>> http://wiki.qemu.org/Contribute/ReportABug
>>
>> What is your command line?
> 
> Could it be that this is a results of compiling qemu with --enable-debug
> to get debugging symbols?

Yes.

Paolo