[Qemu-devel] performance in io virtulization

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i use qemu 2.2 and zhe vm kernel is 3.18

i use fio do experiments in host and vm:

4k randwrite/read  ioengine=libaio

host:                                     vm:

randread   about 200M/S          randread  about   190M/S                               

randwrite   about 160M/S         randwrite  about   65M/S

i tried multiqueue and dataplane ,but no improvement