[Xenomai-help] [Fwd: Performance decrease]

[Philippe Gerum <rpm@xenomai.org>]

-------- 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,
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> 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:
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> drvlib.c:(.text+0x19f8): undefined reference to `__va_to_kva'
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> For what is the real-time support in user space option good for ?
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> If it is necessary for RTDM support, shouldn't it be automatically switched on when choosing the RTDM option ?
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> I am using ELDK-4.0 + latest 2.4.25-developer kernel from Denx + latest subversion xenomai + adeos patch 1.1-04
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> Thanks in advance,
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> Ciao,
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> Daniel.
> 
-- 
Philippe.