From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Sven-Thorsten Dietrich <sven@thebigcorporation.com>
Cc: Hartmut Behrens <hartmut.behrens@gmail.com>,
linux-rt-users@vger.kernel.org
Subject: Re: Improving ARM7 platform performance with CONFIG_PREEMPT_RT
Date: Wed, 12 Sep 2012 22:29:00 +0200 [thread overview]
Message-ID: <5050F08C.1070801@xenomai.org> (raw)
In-Reply-To: <02D8B38C-C6C2-43A8-B601-721B48612106@thebigcorporation.com>
On 09/12/2012 09:01 PM, Sven-Thorsten Dietrich wrote:
>
> On Sep 12, 2012, at 3:20 AM, Hartmut Behrens
> <hartmut.behrens@gmail.com> wrote:
>
>> Hi,
>>
>> I have patched a 3.2 kernel for a OMAP compatible processor (ARM
>> Cortex A8) to be used on an Gumstix Overo with the
>> CONFIG_PREEMPT_RT patch.
>>
>> I have noticed that the latency of the patched kernel on this
>> platform is <300usec (using cyclictest), similar to what is
>> reported for the ARM9 platforms at
>> https://rt.wiki.kernel.org/index.php/CONFIG_PREEMPT_RT_Patch
>>
>> Is this the best performance that can be expected from ARM7/9
>> platforms?
>>
>> Could it be improved by using different kernel config settings -
>> e.g. CONFIG_LATENCY_TRACE=n -
>> https://rt.wiki.kernel.org/index.php/Cyclictest mentions that
>> latency tracing adds significant kernel overhead?
>
>
> There are a lot of options that can be eliminated / optimized to
> reduce memory footprint and overhead.
One of these options is, maybe surprisingly, CONFIG_THUMB2_KERNEL.
--
Gilles.
next prev parent reply other threads:[~2012-09-12 20:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-12 10:20 Improving ARM7 platform performance with CONFIG_PREEMPT_RT Hartmut Behrens
2012-09-12 11:27 ` Tim Sander
2012-09-12 11:39 ` Carsten Emde
2012-09-12 18:50 ` Hartmut Behrens
2012-09-12 19:01 ` Sven-Thorsten Dietrich
2012-09-12 20:29 ` Gilles Chanteperdrix [this message]
2012-09-12 20:22 ` Sven-Thorsten Dietrich
2012-09-13 6:58 ` Hartmut Behrens
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