From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <33139598.1162206356611.JavaMail.ngmail@domain.hid> Date: Mon, 30 Oct 2006 12:05:56 +0100 (CET) From: "M. Koehrer" Subject: Re: Re: [Xenomai-help] Results of xenomai's latency test vs. RTAI's latency In-Reply-To: <4545D257.3000602@domain.hid> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable References: <4545D257.3000602@domain.hid> <21364954.1162202747823.JavaMail.ngmail@domain.hid> List-Id: Help regarding installation and common use of Xenomai List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: jan.kiszka@domain.hid, mathias_koehrer@domain.hid Cc: xenomai@xenomai.org 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 40=B5s! > > On the very same PC I got a value of about 5=B5s using RTAI 3.3-cv runn= ing > the RTAI's > > user/latency test. >=20 > 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 fo= r about 5 minutes. No other activity happens (well, there are a couple of services running lik= e 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. --=20 Mathias Koehrer mathias_koehrer@domain.hid Viel oder wenig? Schnell oder langsam? Unbegrenzt surfen + telefonieren ohne Zeit- und Volumenbegrenzung? DAS TOP ANGEBOT JETZT bei Arcor: g=FCnsti= g und schnell mit DSL - das All-Inclusive-Paket f=FCr clevere Doppel-Sparer, nur 44,85 =80 inkl. DSL- und ISDN-Grundgeb=FChr! http://www.arcor.de/rd/emf-dsl-2