From: Jerin Jacob <jerin.jacob@caviumnetworks.com>
To: "Eads, Gage" <gage.eads@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
"Richardson, Bruce" <bruce.richardson@intel.com>,
"Van Haaren, Harry" <harry.van.haaren@intel.com>,
"hemant.agrawal@nxp.com" <hemant.agrawal@nxp.com>
Subject: Re: [dpdk-dev] [PATCH 2/4] eventdev: implement the northbound APIs
Date: Tue, 29 Nov 2016 07:31:48 +0530 [thread overview]
Message-ID: <20161129020147.GA9930@svelivela-lt.caveonetworks.com> (raw)
In-Reply-To: <9184057F7FC11744A2107296B6B8EB1E01E33E96@FMSMSX108.amr.corp.intel.com>
On Mon, Nov 28, 2016 at 03:53:08PM +0000, Eads, Gage wrote:
> (Bruce's adviced heeded :))
>
> > > > >
> > > > > How would this check work? Wouldn't it prevent any core from
> > > > running the software scheduler in the centralized case?
> > > >
> > > > I guess you may not need RTE_EVENT_DEV_CAP here, instead need flag
> > > > for device configure here
> > > >
> > > > #define RTE_EVENT_DEV_CFG_DISTRIBUTED_SCHED (1ULL << 1)
> > > >
> > > > struct rte_event_dev_config config; config.event_dev_cfg =
> > > > RTE_EVENT_DEV_CFG_DISTRIBUTED_SCHED;
> > > > rte_event_dev_configure(.., &config);
> > > >
> > > > on the driver side on configure,
> > > > if (config.event_dev_cfg & RTE_EVENT_DEV_CFG_DISTRIBUTED_SCHED)
> > > > eventdev->schedule = NULL;
> > > > else // centralized case
> > > > eventdev->schedule = your_centrized_schedule_function;
> > > >
> > > > Does that work?
> > >
> > > Hm, I fear the API would give users the impression that they can select the
> > scheduling behavior of a given eventdev, when a software scheduler is more
> > likely to be either distributed or centralized -- not both.
> >
> > Even if it is capability flag then also it is per "device". Right ?
> > capability flag is more of read only too. Am i missing something here?
> >
>
> Correct, the capability flag I'm envisioning is per-device and read-only.
>
> > >
> > > What if we use the capability flag, and define rte_event_schedule() as the
> > scheduling function for centralized schedulers and rte_event_dequeue() as the
> > scheduling function for distributed schedulers? That way, the datapath could be
> > the simple dequeue -> process -> enqueue. Applications would check the
> > capability flag at configuration time to decide whether or not to launch an
> > lcore that calls rte_event_schedule().
> >
> > I am all for simple "dequeue -> process -> enqueue".
> > rte_event_schedule() added for SW scheduler only, now it may not make sense
> > to add one more check on top of "rte_event_schedule()" to see it is really need
> > or not in fastpath?
> >
>
> Yes, the additional check shouldn't be needed. In terms of the 'typical workflow' description, this is what I have in mind:
>
> *
> * An event driven based application has following typical workflow on fastpath:
> * \code{.c}
> * while (1) {
> *
> * rte_event_dequeue(...);
> *
> * (event processing)
> *
> * rte_event_enqueue(...);
> * }
> * \endcode
> *
> * The point at which events are scheduled to ports depends on the device. For
> * hardware devices, scheduling occurs asynchronously. Software schedulers can
> * either be distributed (each worker thread schedules events to its own port)
> * or centralized (a dedicated thread schedules to all ports). Distributed
> * software schedulers perform the scheduling in rte_event_dequeue(), whereas
> * centralized scheduler logic is located in rte_event_schedule(). The
> * RTE_EVENT_DEV_CAP_DISTRIBUTED_SCHED capability flag indicates whether a
> * device is centralized and thus needs a dedicated scheduling thread that
> * repeatedly calls rte_event_schedule().
Makes sense. I will change the existing schedule description to the
proposed one and add RTE_EVENT_DEV_CAP_DISTRIBUTED_SCHED capability flag
in v2.
Thanks Gage.
> *
> */
next prev parent reply other threads:[~2016-11-29 2:01 UTC|newest]
Thread overview: 109+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-18 5:44 [dpdk-dev] [PATCH 0/4] libeventdev API and northbound implementation Jerin Jacob
2016-11-18 5:44 ` [dpdk-dev] [PATCH 1/4] eventdev: introduce event driven programming model Jerin Jacob
2016-11-23 18:39 ` Thomas Monjalon
2016-11-24 1:59 ` Jerin Jacob
2016-11-24 12:26 ` Bruce Richardson
2016-11-24 15:35 ` Thomas Monjalon
2016-11-25 0:23 ` Jerin Jacob
2016-11-25 11:00 ` Bruce Richardson
2016-11-25 13:09 ` Thomas Monjalon
2016-11-26 0:57 ` Jerin Jacob
2016-11-28 9:10 ` Bruce Richardson
2016-11-26 2:54 ` Jerin Jacob
2016-11-28 9:16 ` Bruce Richardson
2016-11-28 11:30 ` Thomas Monjalon
2016-11-29 4:01 ` Jerin Jacob
2016-11-29 10:00 ` Bruce Richardson
2016-11-25 11:59 ` Van Haaren, Harry
2016-11-25 12:09 ` Richardson, Bruce
2016-11-24 16:24 ` Bruce Richardson
2016-11-24 19:30 ` Jerin Jacob
2016-12-06 3:52 ` [dpdk-dev] [PATCH v2 0/6] libeventdev API and northbound implementation Jerin Jacob
2016-12-06 3:52 ` [dpdk-dev] [PATCH v2 1/6] eventdev: introduce event driven programming model Jerin Jacob
2016-12-06 16:51 ` Bruce Richardson
2016-12-07 18:53 ` Jerin Jacob
2016-12-08 9:30 ` Bruce Richardson
2016-12-08 20:41 ` Jerin Jacob
2016-12-09 15:11 ` Bruce Richardson
2016-12-14 6:55 ` Jerin Jacob
2016-12-07 10:57 ` Van Haaren, Harry
2016-12-08 1:24 ` Jerin Jacob
2016-12-08 11:02 ` Van Haaren, Harry
2016-12-14 13:13 ` Jerin Jacob
2016-12-14 15:15 ` Bruce Richardson
2016-12-15 16:54 ` Van Haaren, Harry
2016-12-07 11:12 ` Bruce Richardson
2016-12-08 1:48 ` Jerin Jacob
2016-12-08 9:57 ` Bruce Richardson
2016-12-14 6:40 ` Jerin Jacob
2016-12-14 15:19 ` Bruce Richardson
2016-12-15 13:39 ` Jerin Jacob
2016-12-06 3:52 ` [dpdk-dev] [PATCH v2 2/6] eventdev: define southbound driver interface Jerin Jacob
2016-12-06 3:52 ` [dpdk-dev] [PATCH v2 3/6] eventdev: implement the northbound APIs Jerin Jacob
2016-12-06 17:17 ` Bruce Richardson
2016-12-07 17:02 ` Jerin Jacob
2016-12-08 9:59 ` Bruce Richardson
2016-12-14 6:28 ` Jerin Jacob
2016-12-06 3:52 ` [dpdk-dev] [PATCH v2 4/6] eventdev: implement PMD registration functions Jerin Jacob
2016-12-06 3:52 ` [dpdk-dev] [PATCH v2 5/6] event/skeleton: add skeleton eventdev driver Jerin Jacob
2016-12-06 3:52 ` [dpdk-dev] [PATCH v2 6/6] app/test: unit test case for eventdev APIs Jerin Jacob
2016-12-06 16:46 ` [dpdk-dev] [PATCH v2 0/6] libeventdev API and northbound implementation Bruce Richardson
2016-12-21 9:25 ` [dpdk-dev] [PATCH v4 " Jerin Jacob
2016-12-21 9:25 ` [dpdk-dev] [PATCH v4 1/6] eventdev: introduce event driven programming model Jerin Jacob
2017-01-25 16:32 ` Eads, Gage
2017-01-25 16:36 ` Richardson, Bruce
2017-01-25 16:53 ` Eads, Gage
2017-01-25 22:36 ` Eads, Gage
2017-01-26 9:39 ` Jerin Jacob
2017-01-26 20:39 ` Eads, Gage
2017-01-27 10:03 ` Bruce Richardson
2017-01-30 10:42 ` Jerin Jacob
2017-02-02 11:18 ` Nipun Gupta
2017-02-02 14:09 ` Jerin Jacob
2017-02-03 6:38 ` Nipun Gupta
2017-02-03 10:58 ` Hemant Agrawal
2017-02-07 4:59 ` Jerin Jacob
2016-12-21 9:25 ` [dpdk-dev] [PATCH v4 2/6] eventdev: define southbound driver interface Jerin Jacob
2017-02-02 11:19 ` Nipun Gupta
2017-02-02 11:34 ` Bruce Richardson
2017-02-02 12:53 ` Nipun Gupta
2017-02-02 13:58 ` Bruce Richardson
2017-02-03 5:59 ` Nipun Gupta
2016-12-21 9:25 ` [dpdk-dev] [PATCH v4 3/6] eventdev: implement the northbound APIs Jerin Jacob
2017-02-02 11:19 ` Nipun Gupta
2017-02-02 14:32 ` Jerin Jacob
2017-02-03 6:59 ` Nipun Gupta
2016-12-21 9:25 ` [dpdk-dev] [PATCH v4 4/6] eventdev: implement PMD registration functions Jerin Jacob
2017-02-02 11:20 ` Nipun Gupta
2017-02-05 13:04 ` Jerin Jacob
2016-12-21 9:25 ` [dpdk-dev] [PATCH v4 5/6] event/skeleton: add skeleton eventdev driver Jerin Jacob
2016-12-21 9:25 ` [dpdk-dev] [PATCH v4 6/6] app/test: unit test case for eventdev APIs Jerin Jacob
2016-11-18 5:45 ` [dpdk-dev] [PATCH 2/4] eventdev: implement the northbound APIs Jerin Jacob
2016-11-21 17:45 ` Eads, Gage
2016-11-21 19:13 ` Jerin Jacob
2016-11-21 19:31 ` Jerin Jacob
2016-11-22 15:15 ` Eads, Gage
2016-11-22 18:19 ` Jerin Jacob
2016-11-22 19:43 ` Eads, Gage
2016-11-22 20:00 ` Jerin Jacob
2016-11-22 22:48 ` Eads, Gage
2016-11-22 23:43 ` Jerin Jacob
2016-11-28 15:53 ` Eads, Gage
2016-11-29 2:01 ` Jerin Jacob [this message]
2016-11-29 3:43 ` Jerin Jacob
2016-11-29 5:46 ` Eads, Gage
2016-11-23 9:57 ` Bruce Richardson
2016-11-23 19:18 ` Thomas Monjalon
2016-11-25 4:17 ` Jerin Jacob
2016-11-25 9:55 ` Richardson, Bruce
2016-11-25 23:08 ` Jerin Jacob
2016-11-18 5:45 ` [dpdk-dev] [PATCH 3/4] event/skeleton: add skeleton eventdev driver Jerin Jacob
2016-11-18 5:45 ` [dpdk-dev] [PATCH 4/4] app/test: unit test case for eventdev APIs Jerin Jacob
2016-11-18 15:25 ` [dpdk-dev] [PATCH 0/4] libeventdev API and northbound implementation Bruce Richardson
2016-11-18 16:04 ` Bruce Richardson
2016-11-18 19:27 ` Jerin Jacob
2016-11-21 9:40 ` Thomas Monjalon
2016-11-21 9:57 ` Bruce Richardson
2016-11-22 0:11 ` Thomas Monjalon
2016-11-22 2:00 ` Yuanhan Liu
2016-11-22 9:05 ` Shreyansh Jain
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