tiobench_5-1-1 QEMU 1.0 testing on Ubuntu 12.10 via the Phoronix Test Suite. qcow2_prealloc_disk1: Processor: QEMU Virtual 1.0 @ 2.66GHz (1 Core), Motherboard: Bochs, Chipset: Red Hat Virtio, Memory: 1024MB, Disk: 32GB, Graphics: Red Hat Device 0100, Audio: Generic 1af4 ID 20, Network: Red Hat Virtio device OS: Ubuntu 12.10, Kernel: 3.5.0-19-generic (x86_64), Desktop: Unity 6.10.0, Display Server: X Server 1.13.0, Display Driver: vesa 2.3.2, Compiler: GCC 4.7, File-System: ext4, Screen Resolution: 1024x768, System Layer: QEMU 1.0 Threaded I/O Tester 0.3.3 Test: Read - Size Per Thread: 32MB - Thread Count: 4 MB/s > Higher Is Better qcow2_prealloc_disk1 . 3310.41 |=============================================== Threaded I/O Tester 0.3.3 Test: Write - Size Per Thread: 32MB - Thread Count: 4 MB/s > Higher Is Better qcow2_prealloc_disk1 . 46.58 |================================================= Threaded I/O Tester 0.3.3 Test: Random Read - Size Per Thread: 32MB - Thread Count: 4 MB/s > Higher Is Better qcow2_prealloc_disk1 . 2755.19 |=============================================== Threaded I/O Tester 0.3.3 Test: Random Write - Size Per Thread: 32MB - Thread Count: 4 MB/s > Higher Is Better qcow2_prealloc_disk1 . 6.54 |==================================================