On 12 September 2013 16:33, Christoffer Dall <christoffer.dall@xxxxxxxxxx> wrote: > On Thu, Sep 12, 2013 at 10:01:10AM +0530, Giridhar Maruthy wrote: >> I am trying to measure filesystem performance on guest OS (using qemu >> with kvm) compared to host using bonnie++. >> >> The root file system on guest is mounted on an AHCI device emulated >> using sd interface (-drive file=/dev/sdb2,if=sd) > Pure device emulation can be extremely slow, depending on the hardware > interface to the device is constructed. In particular SD card emulation is known to be particularly bad (for reasons partly to do with the SD card hardware and interface and partly artefacts of QEMU's implementation). > For any reasonable IO performance, you should use virtio-block. Agreed. -- PMM _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/cucslists/listinfo/kvmarm
