[OASIS Issue Tracker] (VIRTIO-144) VIRTIO_BLK_F_CONFIG_WCE removed from block devices spec

Paolo Bonzini created VIRTIO-144:
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             Summary: VIRTIO_BLK_F_CONFIG_WCE removed from block devices spec
                 Key: VIRTIO-144
                 URL: https://issues.oasis-open.org/browse/VIRTIO-144
             Project: OASIS Virtual I/O Device (VIRTIO) TC
          Issue Type: Bug
    Affects Versions: virtio 1.0 cs02
            Reporter: Paolo Bonzini
            Priority: Critical


VIRTIO_BLK_F_CONFIG_WCE is important in order to achieve good performance (up to 2x, though more realistically +30-40%) in latency-bound workloads. However, it was removed by mistake together with VIRTIO_BLK_F_FLUSH.

The lack of this feature means that virtio 1.0 cs02 does not achieve parity with 0.9.



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