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From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: Joyce Kong <joyce.kong@arm.com>,
	chenbo.xia@intel.com, honnappa.nagarahalli@arm.com,
	ruifeng.wang@arm.com
Cc: dev@dpdk.org, nd@arm.com
Subject: Re: [dpdk-dev] [PATCH v1 0/4] replace smp barriers in virtio with C11 atomic
Date: Fri, 8 Jan 2021 10:16:02 +0100
Message-ID: <23764617-88d1-e16e-eac3-cfdce6cd840e@redhat.com> (raw)
In-Reply-To: <20201221142321.51606-1-joyce.kong@arm.com>



On 12/21/20 3:23 PM, Joyce Kong wrote:
> This patchset is to replace rte smp barriers in virtio with C11 atomic
> built-ins.
> 
> The rte_smp_*mb APIs provide full barrier functionality. However, many
> use cases do not require full barriers. To support such use cases, DPDK
> will adopt C11 barrier semantics and provide wrappers using C11 atomic
> built-ins.[1]
> 
> With this patch set, under 0.001% acceptable loss with 2 cores on vhost
> side and 1 core on virtio side, PVP case(vhost-user + virtio-user) has
> 6.7% perf uplift for the split in_order path on ThunderX2 platform.
> 
> [1] http://code.dpdk.org/dpdk/latest/source/doc/guides/rel_notes/deprecation.rst
> 
> Joyce Kong (4):
>   net/virtio: remove unnecessary rmb barrier
>   net/virtio: replace smp barrier with IO barrier
>   net/virtio: replace full barrier with relaxed barrier for Arm platform
>   net/virtio: replace full barrier with thread fence
> 
>  drivers/net/virtio/virtio_ethdev.c | 10 ++++-----
>  drivers/net/virtio/virtqueue.h     | 35 +++++++++++++++---------------
>  2 files changed, 22 insertions(+), 23 deletions(-)
> 

Series applied to dpdk-next-virtio/main.

Thanks,
Maxime


      parent reply	other threads:[~2021-01-08  9:16 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-21 14:23 Joyce Kong
2020-12-21 14:23 ` [dpdk-dev] [PATCH v1 1/4] net/virtio: remove unnecessary rmb barrier Joyce Kong
2021-01-07 14:12   ` Maxime Coquelin
2020-12-21 14:23 ` [dpdk-dev] [PATCH v1 2/4] net/virtio: replace smp barrier with IO barrier Joyce Kong
2021-01-07 14:42   ` Maxime Coquelin
2020-12-21 14:23 ` [dpdk-dev] [PATCH v1 3/4] net/virtio: replace full barrier with relaxed barrier for Arm platform Joyce Kong
2021-01-07 14:47   ` Maxime Coquelin
2020-12-21 14:23 ` [dpdk-dev] [PATCH v1 4/4] net/virtio: replace full barrier with thread fence Joyce Kong
2021-01-07 16:28   ` Maxime Coquelin
2021-01-08  9:16 ` Maxime Coquelin [this message]

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