From mboxrd@z Thu Jan  1 00:00:00 1970
From: Philippe Gerum <rpm@xenomai.org>
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Date: Wed, 30 Aug 2006 14:36:29 +0200
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Subject: [Xenomai-help] [Fwd: Performance decrease]
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-------- Forwarded Message --------
> From: Daniel Schnell <danielsch@domain.hid>
> To: xenomai-help <xenomai@xenomai.org>
> Subject: Performance decrease
> Date: Wed, 30 Aug 2006 11:58:25 -0000
> 
> Hi,
> 
>  
> 
> I have made some CPU throughput tests with/without "Nucleus options->pervasive real-time support in user-space"  enabled/disabled. And the performance dicrease in using that option is for my processor (MPC5200, 400 MHz) about 10%. On the other side I cannot compile RTDM support in without it; the error message when linking vmlinux at the end of the Kernel compile stage is:
> 
>  
> 
> drvlib.c:(.text+0x19f8): undefined reference to `__va_to_kva'
> 
>  
> 
> 
> 
> For what is the real-time support in user space option good for ?
> 
> If it is necessary for RTDM support, shouldn't it be automatically switched on when choosing the RTDM option ?
> 
>  
> 
> 
> 
> 
> 
> I am using ELDK-4.0 + latest 2.4.25-developer kernel from Denx + latest subversion xenomai + adeos patch 1.1-04
> 
>  
> 
> Thanks in advance,
> 
>  
> 
> 
> 
> Ciao,
> 
>  
> 
> Daniel.
> 
-- 
Philippe.