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 17:16:09 +0200 [thread overview]
Message-ID: <4E81E8B9.8000004@domain.hid> (raw)
In-Reply-To: <20110927151009.GA3345@domain.hid>
On 2011-09-27 17:10, Richard Cochran wrote:
> On Tue, Sep 27, 2011 at 02:20:43PM +0200, Jan Kiszka wrote:
>> 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.
>
> So, how does rtnet support EtherCAT?
There was once the EtherCAT Master Library. IIRC, it was discontinued
and removed from the web for non-technical reasons.
>
> Does it support PowerLink and Profinet?
Not that I know, but that's not the point. You said your approach could
provide the technical foundation for such a class of use cases while I
doubt it would work as is.
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
next prev parent reply other threads:[~2011-09-27 15:16 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
2011-09-27 15:10 ` Richard Cochran
2011-09-27 15:16 ` Jan Kiszka [this message]
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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