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    • F
      block: Add VFIO based NVMe driver · bdd6a90a
      Fam Zheng 提交于
      This is a new protocol driver that exclusively opens a host NVMe
      controller through VFIO. It achieves better latency than linux-aio by
      completely bypassing host kernel vfs/block layer.
      
          $rw-$bs-$iodepth  linux-aio     nvme://
          ----------------------------------------
          randread-4k-1     10.5k         21.6k
          randread-512k-1   745           1591
          randwrite-4k-1    30.7k         37.0k
          randwrite-512k-1  1945          1980
      
          (unit: IOPS)
      
      The driver also integrates with the polling mechanism of iothread.
      
      This patch is co-authored by Paolo and me.
      Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
      Signed-off-by: NFam Zheng <famz@redhat.com>
      Message-Id: <20180116060901.17413-4-famz@redhat.com>
      Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
      Signed-off-by: NFam Zheng <famz@redhat.com>
      bdd6a90a
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