On Thu, Sep 12, 2013 at 10:01:10AM +0530, Giridhar Maruthy wrote: > Hi, > > 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) > > While a sequential character output speed on host (samsung exynos-a15 > platform) fetched a speed of 5686K/sec, the guest (versatile > express-a15) speed was 368K/sec. This translates to around 7% > efficiency. > > Is this an acceptable speed difference with device emulation ? > Pure device emulation can be extremely slow, depending on the hardware interface to the device is constructed. For any reasonable IO performance, you should use virtio-block. -Christoffer _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/cucslists/listinfo/kvmarm
