On Thu, Jul 21, 2022 at 4:44 PM Guo Zhi [off-list ref] wrote:

When this feature has been negotiated, virtio driver will use
descriptors in ring order: starting from offset 0 in the table, and
wrapping around at the end of the table. Vhost devices will always use
descriptors in the same order in which they have been made available.
This can reduce virtio accesses to used ring.

Based on updated virtio-spec, this series realized IN_ORDER prototype
in virtio driver and vhost.

Thanks a lot for the series.

I wonder if you can share any performance numbers for this?

Thanks

Guo Zhi (5):
  vhost: reorder used descriptors in a batch
  vhost: announce VIRTIO_F_IN_ORDER support
  vhost_test: batch used buffer
  virtio: get desc id in order
  virtio: annouce VIRTIO_F_IN_ORDER support

 drivers/vhost/test.c         | 15 +++++++++++-
 drivers/vhost/vhost.c        | 44 ++++++++++++++++++++++++++++++++++--
 drivers/vhost/vhost.h        |  4 ++++
 drivers/virtio/virtio_ring.c | 39 +++++++++++++++++++++++++-------
 4 files changed, 91 insertions(+), 11 deletions(-)

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2.17.1