Messages in this thread | | | Date | Thu, 21 Jul 2022 19:54:35 +0800 | Subject | Re: [RFC 0/5] In virtio-spec 1.1, new feature bit VIRTIO_F_IN_ORDER was introduced. | From | Guo Zhi <> |
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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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