From: "M. Koehrer" <mathias_koehrer@domain.hid>
To: jan.kiszka@domain.hid, mathias_koehrer@domain.hid
Cc: xenomai@xenomai.org
Subject: Re: Re: [Xenomai-help] Results of xenomai's latency test vs. RTAI's latency
Date: Mon, 30 Oct 2006 12:05:56 +0100 (CET) [thread overview]
Message-ID: <33139598.1162206356611.JavaMail.ngmail@domain.hid> (raw)
In-Reply-To: <4545D257.3000602@domain.hid>
Hi Jan,
thanks for your reply.
> > I am currently checking XENOMAI (V2.2.3 on a 2.6.17.7 kernel P4) to see if
> I can use it
> > as replacement for a RTAI 3.3-cv application.
> > The first thing I did was to run the latency test in the the xenomai's
> testsuite directory.
> > The results of the worst time latency are really ugly - about 40µs!
> > On the very same PC I got a value of about 5µs using RTAI 3.3-cv running
> the RTAI's
> > user/latency test.
>
> I'm _very_ sceptical about your 5 us. Could you elaborate on how you
> load your box and how long those tests ran? See also TROUBLESHOOTING in
> the Xenomai source tree on appropriate load for triggering the worst case.
My test setup was the same in both cases.
I connect to the RTAI/Xenomai PC via telnet and let the latency test run for about 5 minutes.
No other activity happens (well, there are a couple of services running like
apache, ... - but they should not cause any load).
The strange thing, is that in Xenomai even after a few seconds a latency in the range of the
maximum latency is shown.
I can retry the tests using a background stress situation.
--
Mathias Koehrer
mathias_koehrer@domain.hid
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next prev parent reply other threads:[~2006-10-30 11:05 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-30 10:05 [Xenomai-help] Results of xenomai's latency test vs. RTAI's latency test M. Koehrer
2006-10-30 10:22 ` Jan Kiszka
2006-10-30 11:05 ` M. Koehrer [this message]
2006-10-30 11:39 ` [Xenomai-help] Results of xenomai's latency test vs. RTAI's latency Jan Kiszka
2006-10-30 11:37 ` [Xenomai-help] Results of xenomai's latency test vs. RTAI's latency test Philippe Gerum
2006-10-30 14:15 ` Re: [Xenomai-help] Results of xenomai's latency test vs. RTAI's M. Koehrer
2006-10-30 14:40 ` Philippe Gerum
2006-10-30 15:34 ` M. Koehrer
2006-10-30 16:23 ` Jan Kiszka
2006-10-30 16:24 ` Gilles Chanteperdrix
2006-10-30 17:44 ` Philippe Gerum
2006-10-30 16:39 ` Jan Kiszka
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