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

[Stefan Priebe - Profihost AG]

Hi,

> Am 16.02.2015 um 15:58 schrieb Andrey Korolyov <address@hidden>:
> 
> On Mon, Feb 16, 2015 at 5:47 PM, Stefan Priebe - Profihost AG
> <address@hidden> wrote:
>> Hi,
>>> Am 16.02.2015 um 15:44 schrieb 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.
>> 
>> *urg* my fault - sorry. Is there a way to get debugging symbols without
>> using enable-debug / getting slower performance?
> 
> Hi Stefan, splitdebug will help you there. Also this is a standard way
> to ship debugging symbols in most distribuitions, so I wonder if you
> may use just a generic build skeleton for this task...

I'm using enable-debug with dh_strip from Debian

Stefan