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

From: Stefan Priebe
Subject: [Qemu-devel] slow speed for virtio-scsi since qemu 2.2
Date: Sun, 15 Feb 2015 19:46:12 +0100
User-agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0


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?


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