From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Marcel van Mierlo <marcel.vanmierlo@marel.com>
Cc: xenomai@xenomai.org
Subject: Re: [Xenomai] High CPU load using q_send under pSOS skin
Date: Fri, 07 Feb 2014 15:38:29 +0100 [thread overview]
Message-ID: <52F4EFE5.2040000@xenomai.org> (raw)
In-Reply-To: <52F4EE97.2070800@marel.com>
On 02/07/2014 03:32 PM, Marcel van Mierlo wrote:
> If I comment out q_send TRAP 8 dosent occur. If I pass NULL as data
> words to q_send, TRAP 8 stops... and %CPU remains low....hmmm do I need
> to ensure stack alignment somehow?
The stack alignment is ensured by the compiler. Starting with ARM EABI,
the stack is aligned on 8 bytes, so, if you do not use special tricks
(like casting a char * pointer to a u_long *pointer, or using
__attribute__((packed))), everything should be aligned properly. Could
you show us the declaration of the buffer passed to q_send ? In fact,
posting a self-contained, minimal example allowing to reproduce the
problem would help.
--
Gilles.
next prev parent reply other threads:[~2014-02-07 14:38 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-06 16:25 [Xenomai] High CPU load using q_send under pSOS skin Marcel van Mierlo
2014-02-06 16:35 ` Gilles Chanteperdrix
2014-02-06 16:57 ` Marcel van Mierlo
2014-02-06 17:26 ` Philippe Gerum
2014-02-06 17:28 ` Philippe Gerum
2014-02-06 19:00 ` Gilles Chanteperdrix
2014-02-07 8:53 ` Philippe Gerum
2014-02-07 13:32 ` Marcel van Mierlo
2014-02-07 13:57 ` Philippe Gerum
2014-02-07 14:03 ` Philippe Gerum
2014-02-07 14:06 ` Philippe Gerum
2014-02-07 14:32 ` Marcel van Mierlo
2014-02-07 14:38 ` Gilles Chanteperdrix [this message]
2014-02-07 15:07 ` Marcel van Mierlo
2014-02-07 15:10 ` Gilles Chanteperdrix
2014-02-07 15:22 ` Marcel van Mierlo
2014-02-07 19:23 ` Gilles Chanteperdrix
2014-02-07 14:08 ` Gilles Chanteperdrix
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