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From: "Mattias Rönnblom" <mattias.ronnblom@ericsson.com>
To: Anoob Joseph <anoobj@marvell.com>,
	Jerin Jacob Kollanukkaran <jerinj@marvell.com>,
	Nikhil Rao <nikhil.rao@intel.com>,
	Erik Gabriel Carrillo <erik.g.carrillo@intel.com>,
	Abhinandan Gujjar <abhinandan.gujjar@intel.com>,
	Bruce Richardson <bruce.richardson@intel.com>,
	Pablo de Lara <pablo.de.lara.guarch@intel.com>
Cc: Narayana Prasad Raju Athreya <pathreya@marvell.com>,
	"dev@dpdk.org" <dev@dpdk.org>,
	Lukas Bartosik <lbartosik@marvell.com>,
	Pavan Nikhilesh Bhagavatula <pbhagavatula@marvell.com>,
	Hemant Agrawal <hemant.agrawal@nxp.com>,
	Nipun Gupta <nipun.gupta@nxp.com>,
	Harry van Haaren <harry.van.haaren@intel.com>,
	Liang Ma <liang.j.ma@intel.com>
Subject: Re: [dpdk-dev] [EXT] Re: [PATCH 00/39] adding eventmode helper library
Date: Mon, 17 Jun 2019 15:23:48 +0200
Message-ID: <7093263b-ff3d-fe84-18fb-43535a959276@ericsson.com> (raw)
In-Reply-To: <MN2PR18MB2877024C35DAF75590322837DFEE0@MN2PR18MB2877.namprd18.prod.outlook.com>

On 2019-06-14 11:18, Anoob Joseph wrote:
> Hi Mattias,
>   
>> A more extensive description of the purpose of the eventmode helper
>> library would be helpful.
>>
>> Is this supposed to be a generic framework for real-world
>> applications, or only something to simplify DPDK the implementation of
>> DPDK example programs and similar?
>   
> This is intended as a generic framework, but the initial targets would be limited to DPDK example applications.
>   
> For any application to use an event device for dynamic load balancing, it has to configure the event device and the adapters. Configuring the adapters would involve providing various parameters based on which the dynamic scheduling should happen. But requiring the application to do all this configuration would make the application complicated as well as the same code has to be repeated for a new application. Event mode helper tries to solve that.
>   
> All the complex configuration would be implemented by the helper library and the helper library would provide a default conf as well.
> 

The task of configuring eventdev and its adaptors, and ethernet devices 
is a daunting task indeed. If we could simplify that, that would be great.

However, the flexibility and many of the parameters are there for a 
reason (those there aren't should be deprecated). I would expect a 
real-world application to tweak quite a few of them. I know our 
applications do.

I worry I have is that if you put eventmode (in its current form) 
forward as a generic framework, applications might start using it, only 
to realize it's not flexible enough, and then eventmode is just an extra 
layer, increasing rather than reducing complexity. Or even worse, the 
application's developers are forced to do a big-bang switch over to 
using the event and ethernet device APIs directly, in case they can't 
patch DPDK to work around the 
eventmode-assumption-that-didn't-hold-for-them.

You could always add flexibility to the framework (as you encounter a 
need for it), but then it will grow in complexity as well.

A less ambitious approach would be to instead do a properly modularized, 
non-trivial eventdev example application, for the applications to start 
off from, instead of a generic library.

I would expect it to be very difficult to design a truly generic 
application framework for eventdev-based applications. Such a framework 
would tie everything that's needed in a non-trivial application 
together. If successful, it would be a huge step toward making DPDK an 
operating system for packet processing applications.

What event devices have you tested with?

  reply index

Thread overview: 81+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-03 17:32 [dpdk-dev] " Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 01/39] examples/l2fwd-event: create copy of l2fwd Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 02/39] examples/l2fwd-event: move macros to common header Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 03/39] examples/l2fwd-event: move structures " Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 04/39] examples/l2fwd-event: move global vars " Anoob Joseph
2019-06-07 10:02   ` Jerin Jacob Kollanukkaran
2019-06-07 10:45     ` Anoob Joseph
2019-06-07 12:47       ` Jerin Jacob Kollanukkaran
2019-06-03 17:32 ` [dpdk-dev] [PATCH 05/39] examples/l2fwd-event: move dataplane code to new file Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 06/39] examples/l2fwd-event: remove unused header includes Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 07/39] examples/l2fwd-event: move drain buffers to new function Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 08/39] examples/l2fwd-event: optimize check for master core Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 09/39] examples/l2fwd-event: move periodic tasks to new func Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 10/39] examples/l2fwd-event: do timer updates only on master Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 11/39] examples/l2fwd-event: move pkt send code to a new func Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 12/39] examples/l2fwd-event: use fprintf in usage print Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 13/39] examples/l2fwd-event: improvements to the " Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 14/39] eventdev: add files for eventmode helper Anoob Joseph
2019-06-10 10:10   ` Jerin Jacob Kollanukkaran
2019-06-03 17:32 ` [dpdk-dev] [PATCH 15/39] eventdev: add routines for logging " Anoob Joseph
2019-06-10 10:12   ` Jerin Jacob Kollanukkaran
2019-06-17  9:09     ` Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 16/39] eventdev: add eventmode CL options framework Anoob Joseph
2019-06-10 10:19   ` Jerin Jacob Kollanukkaran
2019-06-17 10:14     ` Anoob Joseph
2019-06-11  8:58   ` [dpdk-dev] [EXT] " Sunil Kumar Kori
2019-06-03 17:32 ` [dpdk-dev] [PATCH 17/39] eventdev: allow application to set ethernet portmask Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 18/39] eventdev: add framework for eventmode conf Anoob Joseph
2019-06-10 10:06   ` Jerin Jacob Kollanukkaran
2019-06-20  7:26     ` Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 19/39] eventdev: add common initialize routine for eventmode devs Anoob Joseph
2019-06-10 10:23   ` Jerin Jacob Kollanukkaran
2019-06-17 10:22     ` Anoob Joseph
2019-06-11  8:58   ` [dpdk-dev] [EXT] " Sunil Kumar Kori
2019-06-03 17:32 ` [dpdk-dev] [PATCH 20/39] eventdev: add eventdevice init for eventmode Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 21/39] eventdev: add eventdev port-lcore link Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 22/39] eventdev: add option to specify schedule mode for app stage Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 23/39] eventdev: add placeholder for ethdev init Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 24/39] eventdev: add Rx adapter init in eventmode Anoob Joseph
2019-06-10 14:56   ` Carrillo, Erik G
2019-06-11  3:45     ` [dpdk-dev] [EXT] " Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 25/39] eventdev: add routine to validate conf Anoob Joseph
2019-06-10 10:25   ` Jerin Jacob Kollanukkaran
2019-06-17 10:23     ` Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 26/39] eventdev: add default conf for event devs field in conf Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 27/39] eventdev: add default conf for Rx adapter conf Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 28/39] eventdev: add default conf for event port-lcore link Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 29/39] eventdev: add routines to display the eventmode conf Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 30/39] eventdev: add routine to access eventmode link info Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 31/39] eventdev: add routine to access event queue for eth Tx Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 32/39] eventdev: add routine to launch eventmode workers Anoob Joseph
2019-06-10 14:31   ` Carrillo, Erik G
2019-06-17 10:34     ` [dpdk-dev] [EXT] " Anoob Joseph
2019-06-10 14:46   ` [dpdk-dev] " Carrillo, Erik G
2019-06-27  5:50     ` Anoob Joseph
2019-06-11  8:58   ` [dpdk-dev] [EXT] " Sunil Kumar Kori
2019-06-03 17:32 ` [dpdk-dev] [PATCH 33/39] eventdev: add Tx adapter support Anoob Joseph
2019-06-11  8:58   ` [dpdk-dev] [EXT] " Sunil Kumar Kori
2019-06-03 17:32 ` [dpdk-dev] [PATCH 34/39] eventdev: add support for internal ports Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 35/39] eventdev: display Tx adapter conf Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 36/39] examples/l2fwd-event: add eventmode for l2fwd Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 37/39] examples/l2fwd-event: add eventmode worker Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 38/39] " Anoob Joseph
2019-06-03 17:32 ` [dpdk-dev] [PATCH 39/39] " Anoob Joseph
2019-06-07  9:48 ` [dpdk-dev] [PATCH 00/39] adding eventmode helper library Jerin Jacob Kollanukkaran
2019-06-11 10:44   ` Mattias Rönnblom
2019-06-14  9:18     ` [dpdk-dev] [EXT] " Anoob Joseph
2019-06-17 13:23       ` Mattias Rönnblom [this message]
2019-06-20  3:44         ` Anoob Joseph
2019-06-25 10:33 [dpdk-dev] " Jerin Jacob Kollanukkaran
2019-06-27  5:28 ` Anoob Joseph
2019-06-28  3:37   ` Jerin Jacob Kollanukkaran
2019-06-28  8:40     ` Thomas Monjalon
2019-06-28 11:34       ` [dpdk-dev] [EXT] " Anoob Joseph
2019-07-02 14:17         ` Anoob Joseph
2019-07-02 14:26           ` Jerin Jacob Kollanukkaran
2019-07-02 14:49             ` Bruce Richardson
2019-07-02 14:57             ` Thomas Monjalon
2019-07-02 16:18               ` Anoob Joseph
2019-07-02 17:38                 ` Mattias Rönnblom
2019-07-03  1:35                   ` Anoob Joseph
2019-07-03  8:51                     ` Thomas Monjalon
2019-07-03  9:37                       ` Anoob Joseph
2019-07-03 16:30                         ` Thomas Monjalon
2019-07-04  3:34                           ` Anoob Joseph

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