[Xenomai] CAN Loopback with Recieve own message

[Xenomai] CAN Loopback with Recieve own message

[Narasimhaprasad Yedatore Achutha]

Hello All

I have a question on RT-Socket not supporting Receive own message option(CAN_RAW_RECV_OWN_MSGS ) with MSG_CONFIRM flag not supported. I'm trying to understand, if we modify the kernel driver supporting  CAN_RAW_RECV_OWN_MSGS, so that we start receiving transmitted message back at the controller, how much an impact happens  on

-          Real time scheduling

-          Does CAN message missing  cases be frequent at high bus load for real time applications

-          Any other impact we need to consider?

Please let me know if anybody has any experience on this or any  experiments  to share?. Any thoughts or advice will be helpful

Thanks and Regards
Prasad

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Re: [Xenomai] CAN Loopback with Recieve own message

[Gilles Chanteperdrix]

On Sat, Dec 12, 2015 at 01:42:01PM +0000, Narasimhaprasad Yedatore Achutha wrote:
> Hello All
> 
> I have a question on RT-Socket not supporting Receive own message
> option(CAN_RAW_RECV_OWN_MSGS ) with MSG_CONFIRM flag not
> supported. I'm trying to understand, if we modify the kernel
> driver supporting CAN_RAW_RECV_OWN_MSGS, so that we start
> receiving transmitted message back at the controller, how much an
> impact happens on
> 
> -          Real time scheduling
> 
> -          Does CAN message missing cases be frequent at high bus
> -          load for real time applications
> 
> -          Any other impact we need to consider?
> 
> Please let me know if anybody has any experience on this or any
> experiments to share?. Any thoughts or advice will be helpful

I do not see any other reason for not having CAN_RAW_RECV_OWN_MSGS
than the fact that nobody needed this, so nobody implemented it.

-- 
					    Gilles.
https://click-hack.org

Re: [Xenomai] CAN Loopback with Recieve own message

[Narasimhaprasad Yedatore Achutha]

Thanks Giles.  Do you have any idea on other three questions
, if we modify the kernel driver supporting
> CAN_RAW_RECV_OWN_MSGS, so that we start receiving transmitted message
> back at the controller, how much an impact happens on
>
> -          Real time scheduling
>
> -          Does CAN message missing cases be frequent at high bus
> -          load for real time applications
>
> -          Any other impact we need to consider?

Thanks and Regards
Prasad

-----Original Message-----
From: Gilles Chanteperdrix [mailto:gilles.chanteperdrix@xenomai.org]
Sent: Tuesday, December 15, 2015 4:15 AM
To: Narasimhaprasad Yedatore Achutha
Cc: Xenomai@xenomai.org
Subject: Re: [Xenomai] CAN Loopback with Recieve own message

On Sat, Dec 12, 2015 at 01:42:01PM +0000, Narasimhaprasad Yedatore Achutha wrote:
> Hello All
>
> I have a question on RT-Socket not supporting Receive own message
> option(CAN_RAW_RECV_OWN_MSGS ) with MSG_CONFIRM flag not supported.
> I'm trying to understand, if we modify the kernel driver supporting
> CAN_RAW_RECV_OWN_MSGS, so that we start receiving transmitted message
> back at the controller, how much an impact happens on
>
> -          Real time scheduling
>
> -          Does CAN message missing cases be frequent at high bus
> -          load for real time applications
>
> -          Any other impact we need to consider?
>
> Please let me know if anybody has any experience on this or any
> experiments to share?. Any thoughts or advice will be helpful

I do not see any other reason for not having CAN_RAW_RECV_OWN_MSGS than the fact that nobody needed this, so nobody implemented it.

--
					    Gilles.
https://click-hack.org

**************** CAUTION - Disclaimer *****************
This e-mail contains PRIVILEGED AND CONFIDENTIAL INFORMATION intended solely
for the use of the addressee(s). If you are not the intended recipient, please
notify the sender by e-mail and delete the original message. Further, you are not
to copy, disclose, or distribute this e-mail or its contents to any other person and
any such actions are unlawful. This e-mail may contain viruses. Infosys has taken
every reasonable precaution to minimize this risk, but is not liable for any damage
you may sustain as a result of any virus in this e-mail. You should carry out your
own virus checks before opening the e-mail or attachment. Infosys reserves the
right to monitor and review the content of all messages sent to or from this e-mail
address. Messages sent to or from this e-mail address may be stored on the
Infosys e-mail system.
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Re: [Xenomai] CAN Loopback with Recieve own message

[Gilles Chanteperdrix]

On Tue, Dec 15, 2015 at 06:01:34AM +0000, Narasimhaprasad Yedatore Achutha wrote:
> Thanks Giles.  Do you have any idea on other three questions 

The answer to the three questions is implied by my answer: there
should be no problem implementing this. It is not implemented today
not because it poses a particular problem, but probably simply
because nobody needed it.

-- 
					    Gilles.
https://click-hack.org