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

[Stefan Priebe - Profihost AG]

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?
> 
> Paolo
> 

Could it be that this is a results of compiling qemu with --enable-debug
to get debugging symbols?

Stefan