From: Wolfgang Grandegger <wg@grandegger.com>
To: Richard Cochran <richardcochran@gmail.com>
Cc: "Xenomai@xenomai.org" <Xenomai@xenomai.org>
Subject: Re: [Xenomai] Xenomai installation on P1020RDB
Date: Mon, 23 Jul 2012 14:01:49 +0200 [thread overview]
Message-ID: <500D3D2D.2010107@grandegger.com> (raw)
In-Reply-To: <20120723084817.GA30335@localhost.localdomain>
On 07/23/2012 10:48 AM, Richard Cochran wrote:
> On Fri, Jul 20, 2012 at 08:25:22PM +0200, Wolfgang Grandegger wrote:
>>
>> I tested Xenomai recently on a P2020 with mainline Linux 3.2.x with the
>> new iPipe-Patch and got very good latency results, especially with CPU
>> isolation: 65 us without and *8* us with CPU isolation. [I'm still puzzled
>> about the good results with CPU isolation. Maybe that's due to the new
>> iPipe-Patch. Need to re-test when time permits). I have listed the results
>> below.
>
> Almost a year ago, around Linux 2.6.38 or so, I measured 13 us maximum
> latency on the P2020 RBD when using CPU isolation.
OK. Tests with FSL 2.6.35 on a P1025 showed latencies up to 40 us with
CPU isolation (an 65 us without). Similar results I measured with an ARM
i.MX6Q board.
Wolfgang.
next prev parent reply other threads:[~2012-07-23 12:01 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-20 14:31 [Xenomai] Xenomai installation on P1020RDB Lukasz Zemla
2012-07-20 18:25 ` Wolfgang Grandegger
2012-07-23 8:48 ` Richard Cochran
2012-07-23 12:01 ` Wolfgang Grandegger [this message]
2012-07-25 16:18 ` Lukasz Zemla
2012-07-25 17:11 ` Gilles Chanteperdrix
2012-07-25 17:36 ` Gilles Chanteperdrix
2012-07-25 20:15 ` Lukasz Zemla
2012-07-25 20:42 ` Gilles Chanteperdrix
2012-07-26 11:20 ` Lukasz Zemla
2012-07-26 12:00 ` Gilles Chanteperdrix
2012-07-27 15:53 ` Lukasz Zemla
2012-07-27 16:00 ` Gilles Chanteperdrix
2012-07-27 16:08 ` Philippe Gerum
2012-07-27 16:12 ` Lukasz Zemla
2012-07-27 16:19 ` Philippe Gerum
2012-07-29 14:30 ` Philippe Gerum
2012-07-29 14:10 ` Philippe Gerum
2012-07-25 19:26 ` Wolfgang Grandegger
2012-07-25 20:26 ` Lukasz Zemla
2012-07-25 20:55 ` Wolfgang Grandegger
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=500D3D2D.2010107@grandegger.com \
--to=wg@grandegger.com \
--cc=Xenomai@xenomai.org \
--cc=richardcochran@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.