From: Ferruh Yigit <ferruh.yigit@intel.com>
To: patrick.fu@intel.com, dev@dpdk.org, maxime.coquelin@redhat.com,
chenbo.xia@intel.com, zhihong.wang@intel.com
Cc: yinan.wang@intel.com, cheng1.jiang@intel.com, cunming.liang@intel.com
Subject: Re: [dpdk-dev] [PATCH v6 0/2] introduce asynchronous data path for vhost
Date: Tue, 7 Jul 2020 17:45:08 +0100 [thread overview]
Message-ID: <ffb641a4-6c23-6195-2ebc-81c9cff9b4d8@intel.com> (raw)
In-Reply-To: <20200707050709.205480-1-patrick.fu@intel.com>
On 7/7/2020 6:07 AM, patrick.fu@intel.com wrote:
> From: Patrick Fu <patrick.fu@intel.com>
>
> Performing large memory copies usually takes up a major part of CPU
> cycles and becomes the hot spot in vhost-user enqueue operation. To
> offload expensive memory operations from the CPU, this patch set
> proposes to leverage DMA engines, e.g., I/OAT, a DMA engine in the
> Intel's processor, to accelerate large copies.
>
> Large copies are offloaded from the CPU to the DMA in an asynchronous
> manner. The CPU just submits copy jobs to the DMA but without waiting
> for its copy completion. Thus, there is no CPU intervention during
> data transfer; we can save precious CPU cycles and improve the overall
> throughput for vhost-user based applications, like OVS. During packet
> transmission, it offloads large copies to the DMA and performs small
> copies by the CPU, due to startup overheads associated with the DMA.
>
> This patch set construct a general framework that applications can
> leverage to attach DMA channels with vhost-user transmit queues. Four
> new RTE APIs are introduced to vhost library for applications to
> register and use the asynchronous data path. In addition, two new DMA
> operation callbacks are defined, by which vhost-user asynchronous data
> path can interact with DMA hardware. Currently only enqueue operation
> for split queue is implemented, but the framework is flexible to extend
> support for packed queue.
>
> v2:
> update meson file for new header file
> update rte_vhost_version.map to include new APIs
> rename async APIs/structures to be prefixed with "rte_vhost"
> rename some variables/structures for readibility
> correct minor typo in comments/license statements
> refine memory allocation logic for vq internal buffer
> add error message printing in some failure cases
> check inflight async packets in unregistration API call
> mark new APIs as experimental
>
> v3:
> use atomic_xxx() functions in updating ring index
> fix a bug in async enqueue failure handling
>
> v4:
> part of the fix intended in v3 patch was missed, this patch
> adds all thoes fixes
>
> v5:
> minor changes on some function/variable names
> reset CPU batch copy packet count when async enqueue error
> occurs
> disable virtio log feature in async copy mode
> minor optimization on async shadow index flush
>
> v6:
> add some background introduction in the commit message
>
> Patrick Fu (2):
> vhost: introduce async enqueue registration API
> vhost: introduce async enqueue for split ring
>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
Series applied to dpdk-next-net/master, thanks.
next prev parent reply other threads:[~2020-07-07 16:45 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-11 10:02 [dpdk-dev] [PATCH v1 " patrick.fu
2020-06-11 10:02 ` [dpdk-dev] [PATCH v1 1/2] vhost: introduce async data path registration API patrick.fu
2020-06-18 5:50 ` Liu, Yong
2020-06-18 9:08 ` Fu, Patrick
2020-06-19 0:40 ` Liu, Yong
2020-06-25 13:42 ` Maxime Coquelin
2020-06-26 14:28 ` Maxime Coquelin
2020-06-29 1:15 ` Fu, Patrick
2020-06-26 14:44 ` Maxime Coquelin
2020-06-11 10:02 ` [dpdk-dev] [PATCH v1 2/2] vhost: introduce async enqueue for split ring patrick.fu
2020-06-18 6:56 ` Liu, Yong
2020-06-18 11:36 ` Fu, Patrick
2020-06-26 14:39 ` Maxime Coquelin
2020-06-26 14:46 ` Maxime Coquelin
2020-06-29 1:25 ` Fu, Patrick
2020-06-26 14:42 ` [dpdk-dev] [PATCH v1 0/2] introduce asynchronous data path for vhost Maxime Coquelin
2020-07-03 10:27 ` [dpdk-dev] [PATCH v3 " patrick.fu
2020-07-03 10:27 ` [dpdk-dev] [PATCH v3 1/2] vhost: introduce async enqueue registration API patrick.fu
2020-07-03 10:27 ` [dpdk-dev] [PATCH v3 2/2] vhost: introduce async enqueue for split ring patrick.fu
2020-07-03 12:21 ` [dpdk-dev] [PATCH v4 0/2] introduce asynchronous data path for vhost patrick.fu
2020-07-03 12:21 ` [dpdk-dev] [PATCH v4 1/2] vhost: introduce async enqueue registration API patrick.fu
2020-07-06 3:05 ` Liu, Yong
2020-07-06 9:08 ` Fu, Patrick
2020-07-03 12:21 ` [dpdk-dev] [PATCH v4 2/2] vhost: introduce async enqueue for split ring patrick.fu
2020-07-06 11:53 ` [dpdk-dev] [PATCH v5 0/2] introduce asynchronous data path for vhost patrick.fu
2020-07-06 11:53 ` [dpdk-dev] [PATCH v5 1/2] vhost: introduce async enqueue registration API patrick.fu
2020-07-06 11:53 ` [dpdk-dev] [PATCH v5 2/2] vhost: introduce async enqueue for split ring patrick.fu
2020-07-07 5:07 ` [dpdk-dev] [PATCH v6 0/2] introduce asynchronous data path for vhost patrick.fu
2020-07-07 5:07 ` [dpdk-dev] [PATCH v6 1/2] vhost: introduce async enqueue registration API patrick.fu
2020-07-07 8:22 ` Xia, Chenbo
2020-07-07 5:07 ` [dpdk-dev] [PATCH v6 2/2] vhost: introduce async enqueue for split ring patrick.fu
2020-07-07 8:22 ` Xia, Chenbo
2020-07-07 16:45 ` Ferruh Yigit [this message]
2020-07-20 13:26 ` [dpdk-dev] [PATCH v6 0/2] introduce asynchronous data path for vhost Maxime Coquelin
2020-07-21 2:28 ` Fu, Patrick
2020-07-21 8:28 ` Maxime Coquelin
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