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SubjectRe: [RFC 0/5] In virtio-spec 1.1, new feature bit VIRTIO_F_IN_ORDER was introduced.
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On 2022/7/21 17:17, Jason Wang wrote:
> On Thu, Jul 21, 2022 at 4:44 PM Guo Zhi <qtxuning1999@sjtu.edu.cn> 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

As a RFC series, current prototype only support virtio_test, and its
performance evaluation between

in order and traditional has little difference. We can focus on the
prototype design at this stage.

I will continue work to support real network driver and device, thus
share more persuasive performance result.

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
>>

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