[ https://issues.oasis-open.org/browse/VIRTIO-144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael Tsirkin updated VIRTIO-144:
-----------------------------------
Proposal: ">http://mid.gmane.org/[email protected] (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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