DPDK patches and discussions
 help / color / mirror / Atom feed
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 0/8] replace smp barriers in vhost with C11 atomic
Date: Fri, 8 Jan 2021 10:16:13 +0100
Message-ID: <46d03859-d6d5-532a-4afb-c1c0bf53f1e4@redhat.com> (raw)
In-Reply-To: <20201221155033.6771-1-joyce.kong@arm.com>



On 12/21/20 4:50 PM, Joyce Kong wrote:
> This patchset is to replace rte smp barriers in vhost 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 patchset, PVP case(vhost-user + virtio-user) has 9.8% perf
> uplift for the split in_order path and no perf degradation for the
> packed in_order path under 0.001% acceptable loss on ThunderX2 platform.
> 
> [1] http://code.dpdk.org/dpdk/latest/source/doc/guides/rel_notes/deprecation.rst
> 
> Joyce Kong (8):
>   examples/vhost: relax memory ordering when enqueue/dequeue
>   examples/vhost_blk: replace smp with thread fence
>   vhost: remove unnecessary smp barrier for desc flags
>   vhost: remove unnecessary smp barrier for avail idx
>   vhost: relax full barriers for desc flags
>   vhost: relax full barriers for used idx
>   vhost: replace smp with thread fence for packed vring
>   vhost: replace smp with thread fence for control path
> 
>  examples/vhost/virtio_net.c    | 12 ++++--------
>  examples/vhost_blk/vhost_blk.c |  8 ++++----
>  lib/librte_vhost/vdpa.c        |  4 ++--
>  lib/librte_vhost/vhost.c       | 18 +++++++++---------
>  lib/librte_vhost/vhost.h       |  6 +++---
>  lib/librte_vhost/vhost_user.c  |  2 +-
>  lib/librte_vhost/virtio_net.c  | 26 +++++++++++---------------
>  7 files changed, 34 insertions(+), 42 deletions(-)
> 

Series applied to dpdk-next-virtio/main.

Thanks,
Maxime


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

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-21 15:50 Joyce Kong
2020-12-21 15:50 ` [dpdk-dev] [PATCH v1 1/8] examples/vhost: relax memory ordering when enqueue/dequeue Joyce Kong
2021-01-07 16:33   ` Maxime Coquelin
2020-12-21 15:50 ` [dpdk-dev] [PATCH v1 2/8] examples/vhost_blk: replace smp with thread fence Joyce Kong
2021-01-07 16:35   ` Maxime Coquelin
2020-12-21 15:50 ` [dpdk-dev] [PATCH v1 3/8] vhost: remove unnecessary smp barrier for desc flags Joyce Kong
2021-01-07 16:38   ` Maxime Coquelin
2020-12-21 15:50 ` [dpdk-dev] [PATCH v1 4/8] vhost: remove unnecessary smp barrier for avail idx Joyce Kong
2021-01-07 16:43   ` Maxime Coquelin
2020-12-21 15:50 ` [dpdk-dev] [PATCH v1 5/8] vhost: relax full barriers for desc flags Joyce Kong
2021-01-07 16:45   ` Maxime Coquelin
2020-12-21 15:50 ` [dpdk-dev] [PATCH v1 6/8] vhost: relax full barriers for used idx Joyce Kong
2021-01-07 16:46   ` Maxime Coquelin
2020-12-21 15:50 ` [dpdk-dev] [PATCH v1 7/8] vhost: replace smp with thread fence for packed vring Joyce Kong
2021-01-07 17:06   ` Maxime Coquelin
2020-12-21 15:50 ` [dpdk-dev] [PATCH v1 8/8] vhost: replace smp with thread fence for control path Joyce Kong
2021-01-07 17:15   ` Maxime Coquelin
2021-01-08  9:16 ` Maxime Coquelin [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=46d03859-d6d5-532a-4afb-c1c0bf53f1e4@redhat.com \
    --to=maxime.coquelin@redhat.com \
    --cc=chenbo.xia@intel.com \
    --cc=dev@dpdk.org \
    --cc=honnappa.nagarahalli@arm.com \
    --cc=joyce.kong@arm.com \
    --cc=nd@arm.com \
    --cc=ruifeng.wang@arm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

DPDK patches and discussions

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://inbox.dpdk.org/dev/0 dev/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 dev dev/ https://inbox.dpdk.org/dev \
		dev@dpdk.org
	public-inbox-index dev

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.dev


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git