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

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

     [ https://issues.oasis-open.org/browse/VIRTIO-144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Tsirkin updated VIRTIO-144:
-----------------------------------

    Proposal: 1435846822-22731-1-git-send-email-pbonzini@redhat.com">http://mid.gmane.org/1435846822-22731-1-git-send-email-pbonzini@redhat.com  (was: A patch to document caching behavior and restore VIRTIO_BLK_F_CONFIG_WCE will be sent to the TC mailing list.)

> 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
>              Labels: AdoptionBlocker
>
> 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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