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From: Jan Kiszka <jan.kiszka@domain.hid>
To: Richard Cochran <richardcochran@domain.hid>
Cc: "xenomai@xenomai.org" <xenomai@xenomai.org>
Subject: Re: [Xenomai-core] [RFC 0/1] Class driver for raw Ethernet packets
Date: Tue, 27 Sep 2011 14:20:43 +0200	[thread overview]
Message-ID: <4E81BF9B.1030401@domain.hid> (raw)
In-Reply-To: <20110927120122.GA10155@domain.hid>

On 2011-09-27 14:01, Richard Cochran wrote:
> Again, every MAC driver needs to be tastefully and wisely adapted. I
> don't necessarily need to avoid coalescing. The goal (for me) is *not*
> to provide deterministic Ethernet performance. Instead the RT packets
> should just be delivered ASAP.

This is obviously the point I completely missed. And it makes the whole
thing fairly uninteresting IMHO. If you want to do Ethercat, PowerLink
or Profinet (RT), you do need a certain level of determinism along the
*whole* packet path. And for the latter two, you definitely need RT IRQ
support, Ethercat can be OK to poll in fast setups.

>From that POV, your approach is likely OK. But I doubt its of generic
use, specifically for industrial RT Ethernet.

Jan

PS: You do have a stack, even if you don't like it: driver, packet
layer, application. :)

-- 
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux


  reply	other threads:[~2011-09-27 12:20 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-23 11:02 [Xenomai-core] [RFC 0/1] Class driver for raw Ethernet packets Richard Cochran
2011-09-23 11:02 ` [Xenomai-core] [RFC 1/1] Add a class " Richard Cochran
2011-09-23 11:27 ` [Xenomai-core] [RFC 0/1] Class " Richard Cochran
2011-09-23 13:34 ` Peter Soetens
2011-09-23 13:50 ` Jan Kiszka
2011-09-26 11:41   ` Richard Cochran
2011-09-27  8:26     ` Jan Kiszka
2011-09-27 12:01       ` Richard Cochran
2011-09-27 12:20         ` Jan Kiszka [this message]
2011-09-27 15:10           ` Richard Cochran
2011-09-27 15:16             ` Jan Kiszka
2011-09-27 16:05               ` Richard Cochran
2011-09-27 16:26                 ` Jan Kiszka
2011-09-27 16:30                   ` Jan Kiszka
2011-09-27 17:04                     ` Richard Cochran
2011-09-27 17:25                       ` Jan Kiszka
2011-09-27 17:00                   ` Richard Cochran
2011-09-27 17:25                     ` Jan Kiszka
2011-09-28  8:16                       ` Richard Cochran
2011-09-28  8:29                         ` Jan Kiszka
2011-09-27 18:02                     ` Gilles Chanteperdrix

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