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From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: Marvin Liu <yong.liu@intel.com>,
	chenbo.xia@intel.com, zhihong.wang@intel.com
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v3 0/5] vhost add vectorized data path
Date: Mon, 12 Oct 2020 10:21:59 +0200
Message-ID: <7d902e14-1e4f-31d9-c7f6-7a57e00186ab@redhat.com> (raw)
In-Reply-To: <20201009081410.63944-1-yong.liu@intel.com>

Hi Marvin,

On 10/9/20 10:14 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. On skylake
> server, it can bring 6% performance gain in loopback case and around 4%
> performance gain in PvP case.

IMHO, 4% gain on PVP is not a significant gain if we compare to the
added complexity. Moreover, I guess this is 4% gain with testpmd-based
PVP? If this is the case it may be even lower with OVS-DPDK PVP
benchmark, I will try to do a benchmark this week.

Thanks,
Maxime

> Vhost application can choose whether using vectorized acceleration, just
> like external buffer feature. 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.
> 
> v3:
> * rename vectorized datapath file
> * eliminate the impact when avx512 disabled
> * dynamically allocate memory regions structure
> * remove unlikely hint for in_order
> 
> 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            | 239 +++++++++++++++++++
>  lib/librte_vhost/vhost_user.c       |  26 +++
>  lib/librte_vhost/virtio_net.c       | 258 ++++-----------------
>  lib/librte_vhost/virtio_net_avx.c   | 344 ++++++++++++++++++++++++++++
>  11 files changed, 718 insertions(+), 216 deletions(-)
>  create mode 100644 lib/librte_vhost/virtio_net_avx.c
> 


  parent reply	other threads:[~2020-10-12  8:22 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-19  3:24 [dpdk-dev] [PATCH v1 " Marvin Liu
2020-08-19  3:24 ` [dpdk-dev] [PATCH v1 1/5] vhost: " Marvin Liu
2020-09-21  6:48   ` [dpdk-dev] [PATCH v2 0/5] vhost " Marvin Liu
2020-09-21  6:48     ` [dpdk-dev] [PATCH v2 1/5] vhost: " Marvin Liu
2020-09-21  6:48     ` [dpdk-dev] [PATCH v2 2/5] vhost: reuse packed ring functions Marvin Liu
2020-09-21  6:48     ` [dpdk-dev] [PATCH v2 3/5] vhost: prepare memory regions addresses Marvin Liu
2020-10-06 15:06       ` Maxime Coquelin
2020-09-21  6:48     ` [dpdk-dev] [PATCH v2 4/5] vhost: add packed ring vectorized dequeue Marvin Liu
2020-10-06 14:59       ` Maxime Coquelin
2020-10-08  7:05         ` Liu, Yong
2020-10-06 15:18       ` Maxime Coquelin
2020-10-09  7:59         ` Liu, Yong
2020-09-21  6:48     ` [dpdk-dev] [PATCH v2 5/5] vhost: add packed ring vectorized enqueue Marvin Liu
2020-10-06 15:00       ` Maxime Coquelin
2020-10-08  7:09         ` Liu, Yong
2020-10-06 13:34     ` [dpdk-dev] [PATCH v2 0/5] vhost add vectorized data path Maxime Coquelin
2020-10-08  6:20       ` Liu, Yong
2020-10-09  8:14   ` [dpdk-dev] [PATCH v3 " Marvin Liu
2020-10-09  8:14     ` [dpdk-dev] [PATCH v3 1/5] vhost: " Marvin Liu
2020-10-09  8:14     ` [dpdk-dev] [PATCH v3 2/5] vhost: reuse packed ring functions Marvin Liu
2020-10-09  8:14     ` [dpdk-dev] [PATCH v3 3/5] vhost: prepare memory regions addresses Marvin Liu
2020-10-09  8:14     ` [dpdk-dev] [PATCH v3 4/5] vhost: add packed ring vectorized dequeue Marvin Liu
2020-10-09  8:14     ` [dpdk-dev] [PATCH v3 5/5] vhost: add packed ring vectorized enqueue Marvin Liu
2020-10-12  8:21     ` Maxime Coquelin [this message]
2020-10-12  9:10       ` [dpdk-dev] [PATCH v3 0/5] vhost add vectorized data path Liu, Yong
2020-10-12  9:57         ` Maxime Coquelin
2020-10-12 13:24           ` Liu, Yong
2020-10-15 15:28       ` Liu, Yong
2020-10-15 15:35         ` Maxime Coquelin
2020-08-19  3:24 ` [dpdk-dev] [PATCH v1 2/5] vhost: reuse packed ring functions Marvin Liu
2020-08-19  3:24 ` [dpdk-dev] [PATCH v1 3/5] vhost: prepare memory regions addresses Marvin Liu
2020-08-19  3:24 ` [dpdk-dev] [PATCH v1 4/5] vhost: add packed ring vectorized dequeue Marvin Liu
2020-09-18 13:44   ` Maxime Coquelin
2020-09-21  6:26     ` Liu, Yong
2020-09-21  7:47       ` Liu, Yong
2020-08-19  3:24 ` [dpdk-dev] [PATCH v1 5/5] vhost: add packed ring vectorized enqueue Marvin Liu

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