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From: "Mattias Rönnblom" <mattias.ronnblom@ericsson.com>
To: Luca Boccassi <bluca@debian.org>,
	"jerinj@marvell.com" <jerinj@marvell.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
	"bruce.richardson@intel.com" <bruce.richardson@intel.com>
Subject: Re: [dpdk-dev] [RFC] eventdev: introduce event dispatcher
Date: Fri, 26 Feb 2021 07:48:28 +0000	[thread overview]
Message-ID: <1e354c12-4754-bc67-77ff-ad0296e51ce3@ericsson.com> (raw)
In-Reply-To: <095a611c0e90ec7b5f36847a7bd2366a28e155c0.camel@debian.org>

On 2021-02-22 16:28, Luca Boccassi wrote:
> On Thu, 2021-02-18 at 19:30 +0100, Mattias Rönnblom wrote:
>> The purpose of the event dispatcher is primarily to decouple different
>> parts of an application (e.g., processing pipeline stages), which
>> share the same underlying event device.
>>
>> The event dispatcher replaces the conditional logic (often, a switch
>> statement) that typically follows an event device dequeue operation,
>> where events are dispatched to different parts of the application
>> based on the destination queue id.
>>
>> The concept is similar to a UNIX file descriptor event loop library.
>> Instead of tying callback functions to fds as for example libevent
>> does, the event dispatcher binds callbacks to queue ids.
>>
>> An event dispatcher is configured to dequeue events from a specific
>> event device, and ties into the service core framework, to do its (and
>> the application's) work.
>>
>> The event dispatcher provides a convenient way for an eventdev-based
>> application to use service cores for application-level processing, and
>> thus for sharing those cores with other DPDK services.
>>
>> Signed-off-by: Mattias Rönnblom <mattias.ronnblom@ericsson.com>
>> ---
>>   lib/librte_eventdev/Makefile                 |   2 +
>>   lib/librte_eventdev/meson.build              |   6 +-
>>   lib/librte_eventdev/rte_event_dispatcher.c   | 420 +++++++++++++++++++
>>   lib/librte_eventdev/rte_event_dispatcher.h   | 251 +++++++++++
>>   lib/librte_eventdev/rte_eventdev_version.map |  10 +
>>   5 files changed, 687 insertions(+), 2 deletions(-)
>>   create mode 100644 lib/librte_eventdev/rte_event_dispatcher.c
>>   create mode 100644 lib/librte_eventdev/rte_event_dispatcher.h
> Hi,
>
> Is this intended to be used by applications or by PMDs? If the former,
> then IMHO the interface should really be based around (or allow using)
> FDs, so that it can be polled. Applications normally have more event
> sources that just DPDK.
>
It's for applications. File descriptors might be involved in the API 
somehow, but I think for most applications, they are too costly. I mean, 
the whole point of DPDK is to avoid the operating system overhead.



  reply	other threads:[~2021-02-26  7:48 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-18 18:30 Mattias Rönnblom
2021-02-22 15:28 ` Luca Boccassi
2021-02-26  7:48   ` Mattias Rönnblom [this message]
2021-02-25 12:32 ` Jerin Jacob
2021-02-26  8:01   ` Mattias Rönnblom
2021-03-07 13:04     ` Jerin Jacob
2021-03-15 14:44       ` Mattias Rönnblom
2021-03-15 15:00         ` Van Haaren, Harry
2021-03-22  9:50           ` Mattias Rönnblom
2021-04-09 11:32             ` [dpdk-dev] [RFC v2] " Mattias Rönnblom

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