On Wed, Jul 2, 2014 at 8:34 PM, Michael S. Tsirkin <m...@redhat.com> wrote: > On Wed, Jun 04, 2014 at 10:05:55AM +0800, Ming Lei wrote: >> Both 'indirect_desc' and 'event_idx' are bus independent features, >> and they should be enabled for mmio devices too. >> >> On arm64 quad core VM(qemu-kvm), the patch can increase block I/O >> performance a lot with latest linux tree: >> - without the patch: 14K IOPS >> - with the patch: 34K IOPS >> >> fio script: >> [global] >> direct=1 >> bsrange=4k-4k >> timeout=10 >> numjobs=4 >> ioengine=libaio >> iodepth=64 >> >> filename=/dev/vdc >> group_reporting=1 >> >> [f1] >> rw=randread >> >> Cc: Peter Maydell <peter.mayd...@linaro.org> >> Signed-off-by: Ming Lei <ming....@canonical.com> > > Applied, thanks! > I'm guessing this doesn't affect cross-version > migration since virtio-mmio isn't used on > a PC and that's the only versioned machine.
Yes, I think so. Even ARM/ARM64 will use virtio-pci if kernel support is ready because virtio-pci has better support than virtio-mmio. Thanks,
