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From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
To: Paolo Bonzini <pbonzini@redhat.com>, qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] slow speed for virtio-scsi since qemu 2.2
Date: Mon, 16 Feb 2015 15:43:50 +0100	[thread overview]
Message-ID: <54E20226.8090103@profihost.ag> (raw)
In-Reply-To: <54E1E188.4050407@redhat.com>

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

  reply	other threads:[~2015-02-16 14:43 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-15 18:46 [Qemu-devel] slow speed for virtio-scsi since qemu 2.2 Stefan Priebe
2015-02-16 11:06 ` Alexandre DERUMIER
2015-02-16 12:24 ` Paolo Bonzini
2015-02-16 14:43   ` Stefan Priebe - Profihost AG [this message]
2015-02-16 14:44     ` Paolo Bonzini
2015-02-16 14:47       ` Stefan Priebe - Profihost AG
2015-02-16 14:49         ` Paolo Bonzini
2015-02-16 15:41           ` Stefan Priebe - Profihost AG
2015-02-16 15:49             ` Paolo Bonzini
2015-02-16 19:02               ` Stefan Priebe
2015-02-16 15:50             ` Andreas Färber
2015-02-16 19:02               ` Stefan Priebe
2015-02-16 14:58         ` Andrey Korolyov
2015-02-16 15:38           ` Stefan Priebe - Profihost AG

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