Re: [RFC 0/5] In virtio-spec 1.1, new feature bit VIRTIO_F_IN_ORDER was introduced.

[Jason Wang]

On Thu, Jul 21, 2022 at 4:44 PM Guo Zhi <qtxuning1999@xxxxxxxxxxx> 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(-)
>
> --
> 2.17.1
>