Re: [Qemu-devel] [RFC PATCH 0/8] virtio-net 1.1 userspace backend support

[Wei Xu <wexu@redhat.com>]

On Tue, Apr 10, 2018 at 11:46:47AM +0800, Jason Wang wrote:
>
> 
> On 2018年04月04日 20:53, wexu@redhat.com wrote:
> >From: Wei Xu <wexu@redhat.com>
> >
> >This is a prototype for virtio-net 1.1 support in userspace backend,
> >only minimum part are included in this RFC(roughly synced to v8 as
> >Jason and Tiwei's RFC).
> >
> >Test has been done together with Tiwei's RFC guest virtio-net driver
> >patch, ping and a quick iperf test successfully.
> >
> >Issues:
> >1. Rx performance of Iperf is much slower than TX.
> >     TX: 13-15Gb
> >     RX: 100-300Mb
> 
> This needs to be investigated. What's the pps of TX/RX then? (Maybe you can
> try Jen's dpdk code too).

Yes, I haven't tune any tso/gso on tap so the pps should match the bandwidth,
will try some more debugging and tried Jen's code if I can not resolve it.

Wei

> 
> Thanks
> 
> >
> >Missing:
> >- device and driver
> >- indirect descriptor
> >- migration
> >- vIOMMU support
> >- other revisions since v8
> >- see FIXME
> >
> >Wei Xu (8):
> >   virtio: feature bit, data structure for packed ring
> >   virtio: memory cache for packed ring
> >   virtio: add empty check for packed ring
> >   virtio: add detach element for packed ring(1.1)
> >   virtio: notification tweak for packed ring
> >   virtio: flush/push support for packed ring
> >   virtio: get avail bytes check for packed ring
> >   virtio: queue pop support for packed ring
> >
> >  hw/virtio/virtio.c                             | 618 +++++++++++++++++++++++--
> >  include/hw/virtio/virtio.h                     |  12 +-
> >  include/standard-headers/linux/virtio_config.h |   2 +
> >  3 files changed, 601 insertions(+), 31 deletions(-)
> >
>