[dpdk-dev] [PATCH v2 0/5] vhost add vectorized data path
Liu, Yong
yong.liu at intel.com
Thu Oct 8 08:20:37 CEST 2020
> -----Original Message-----
> From: Maxime Coquelin <maxime.coquelin at redhat.com>
> Sent: Tuesday, October 6, 2020 9:34 PM
> To: Liu, Yong <yong.liu at intel.com>; Xia, Chenbo <chenbo.xia at intel.com>;
> Wang, Zhihong <zhihong.wang at intel.com>
> Cc: dev at dpdk.org
> Subject: Re: [PATCH v2 0/5] vhost add vectorized data path
>
> Hi,
>
> On 9/21/20 8:48 AM, Marvin Liu wrote:
> > Packed ring format is imported since virtio spec 1.1. All descriptors
> > are compacted into one single ring when packed ring format is on. It is
> > straight forward that ring operations can be accelerated by utilizing
> > SIMD instructions.
> >
> > This patch set will introduce vectorized data path in vhost library. If
> > vectorized option is on, operations like descs check, descs writeback,
> > address translation will be accelerated by SIMD instructions. Vhost
> > application can choose whether using vectorized acceleration, it is
> > like external buffer and zero copy features.
> >
> > If platform or ring format not support vectorized function, vhost will
> > fallback to use default batch function. There will be no impact in current
> > data path.
>
> As a pre-requisite, I'd like some performance numbers in both loopback
> and PVP to figure out if adding such complexity is worth it, given we
> will have to support it for at least one year.
>
Thanks for suggestion, will add some reference numbers in next version.
> Thanks,
> Maxime
>
> > v2:
> > * add vIOMMU support
> > * add dequeue offloading
> > * rebase code
> >
> > Marvin Liu (5):
> > vhost: add vectorized data path
> > vhost: reuse packed ring functions
> > vhost: prepare memory regions addresses
> > vhost: add packed ring vectorized dequeue
> > vhost: add packed ring vectorized enqueue
> >
> > doc/guides/nics/vhost.rst | 5 +
> > doc/guides/prog_guide/vhost_lib.rst | 12 +
> > drivers/net/vhost/rte_eth_vhost.c | 17 +-
> > lib/librte_vhost/meson.build | 16 ++
> > lib/librte_vhost/rte_vhost.h | 1 +
> > lib/librte_vhost/socket.c | 5 +
> > lib/librte_vhost/vhost.c | 11 +
> > lib/librte_vhost/vhost.h | 235 +++++++++++++++++++
> > lib/librte_vhost/vhost_user.c | 11 +
> > lib/librte_vhost/vhost_vec_avx.c | 338
> ++++++++++++++++++++++++++++
> > lib/librte_vhost/virtio_net.c | 257 ++++-----------------
> > 11 files changed, 692 insertions(+), 216 deletions(-)
> > create mode 100644 lib/librte_vhost/vhost_vec_avx.c
> >
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