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Resolve VIRTIO-144: VIRTIO_BLK_F_CONFIG_WCE removed from block devices spec

Should the TC accept changes listed in the description to resolve issue VIRTIO-144, for inclusion in specification version(s) "virtio 1.0 cs04", and future versions of the specification?

Please vote Yes if you agree with all of the following.
If you disagree, please vote No.
If you don't have an opinion, please vote Abstain.

I move that:
The TC agrees to resolve the following specification issue:
VIRTIO-144: VIRTIO_BLK_F_CONFIG_WCE removed from block devices spec
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.

The TC accepts the following proposed changes to the specification:
Clarify definition of writeback and writethrough caching, clarify the influence of the
VIRTIO_BLK_F_FLUSH feature on caching, strengthen the requirement for persisting writes to MUST after a VIRTIO_BLK_T_FLUSH request (and in other cases too involving the new features), introduce VIRTIO_BLK_F_FLUSH and VIRTIO_BLK_F_CONFIG_WCE for non-transitional devices.

The TC agrees to include the above change(s) in specification version(s) "virtio 1.0 cs04", and future versions of the


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 [ ]  Yes
 [ ]  No
 [ ]  Abstain
Opening:   Sunday, 11 October 2015 @ 11:15 am EDT
Closing:   Sunday, 18 October 2015 @ 11:15 am EDT
Group:   OASIS Virtual I/O Device (VIRTIO) TC
Ballot has closed.

Referenced Items
Name Type Date Action

Voting Details

Voting Summary

Options with highest number of votes are bold

Option # Votes % of Total
Yes 6 100%
No 0 0%
Abstain 0
Eligible members who have voted: 6 of 7 86%
Eligible members who have abstained: 0 of 7 0%
Eligible members who have not voted: 1 of 7 14%

Voting Details

Voter Company VoteReference Document and/or Comment
Pawel Moll
ARM Limited
Cornelia Huck
Bryan Venteicher
Daniel Kiper
James Bottomley
Parallels IP Holdings GmbH
Amit Shah
Red Hat
Michael S. Tsirkin
Red Hat