From: Bernhard Schiffner <bernhard@schiffner-limbach.de>
To: linux-rt-users@vger.kernel.org
Subject: Re: Measuring scheduling latency for RT threads
Date: Wed, 19 Nov 2014 14:11:37 +0100 [thread overview]
Message-ID: <9785835.e6QRrDJeRk@bs8> (raw)
In-Reply-To: <trinity-4b6e4283-c92f-4553-af86-5fb9e1fb1541-1416401016597@3capp-gmx-bs35>
Am Mittwoch, 19. November 2014, 13:43:36 schrieben Sie:
> I have a complex automation project with makes heavy use of real time prio
> threads working with external hardware connected by e.g. TCP/IP. IMHO most
> of my latencies simply come from the fact that there are multiple threads
> running on the same RT prio being scheduled FIFO. (poor design, yes, but
> that's what I want to fix) Expected response time is in low millsecond
> area, so no miroseconds juggling here. The process is running (alone, no
> other processes there) on one CPU of an i5 quad core (using 3.13.0-35
> ubuntu 14.04)
The expected behavior is "in general" only achiveable with patched kernels.
The RT-patches are available here:
https://www.kernel.org/pub/linux/kernel/projects/rt/
(Notice availability only for even kernel numbers.)
So please get first of all a kernel working suited for "real realtime". This
step should be quite simple :-)
Good luck!
Bernhard
next prev parent reply other threads:[~2014-11-19 13:11 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-19 12:43 Measuring scheduling latency for RT threads "Jürgen Lanner"
2014-11-19 13:11 ` Bernhard Schiffner [this message]
2014-11-19 13:19 ` Stanislav Meduna
2014-11-19 17:59 ` Clark Williams
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=9785835.e6QRrDJeRk@bs8 \
--to=bernhard@schiffner-limbach.de \
--cc=linux-rt-users@vger.kernel.org \
/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.