Re: QUESTIONS ABOUT PREEMPT_RT on S3C24X0
Gilles Chanteperdrix <[email protected]>
| Newsgroups | gmane.linux.ports.arm.general |
|---|---|
| Message-ID | <[email protected]> |
gisspirit wrote:
> Hi,all
> This is the first time that I send a email to the linux arm mailing list.
> Recently I began to study CONFIG_PREEMPT_RT in the Real-Time Linux WIFI,unfortunately I find that CONFIG_PREEMPT_RT does not perform well on
> all the arms(refer to
> "1.6Which architectures does the CONFIG_PREEMPT_RT patch support? "
> on the web sitehttp://rt.wiki.kernel.org/index.php/Frequently_Asked_Questions).
> But I find the some platforms tested and in use with CONFIG_PREEMPT_RT ,such as
> Atmel AT91RM9200-EK ,(refer to http://rt.wiki.kernel.org/index.php/CONFIG_PREEMPT_RT_Patch#Platforms_Tested_and_in_Use_with_CONFIG_PREEMPT_RT)
>
> What I want to konw is that whether someone has tested S3C24X0 with CONFIG_PREEMPT_RT.
> Best wishes to all!
I do not know about S3C24X0, but have tested the PREEMPT_RT patch on
Intel IXP465, and it seemed to work well enough. However, this is not
the reason for my post. What I wanted to tell you is that if you are
concerned about performance, there is something which you should really
test, it is the FCSE patch, last posted on this list here:
http://lists.arm.linux.org.uk/lurker/message/20090505.073913.9e5b2512.en.html
You can combine it with the PREEMPT_RT patch, and on the platforms I
tested it, when used in "guaranteed" mode, it improves scheduling
latency somewhere between 50us and 100us.
--
Gilles.
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