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

[Alexandre DERUMIER]

H Stefan,

only for write ? or also read ?

I'll try to reproduce on my test cluster.


----- Mail original -----
De: "Stefan Priebe" <address@hidden>
À: "qemu-devel" <address@hidden>
Envoyé: Dimanche 15 Février 2015 19:46:12
Objet: [Qemu-devel] slow speed for virtio-scsi since qemu 2.2

Hi, 

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. 

Is there a known regression? 

Greets, 
Stefan