From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4624EDD6.1010902@domain.hid> Date: Tue, 17 Apr 2007 17:55:02 +0200 From: Gilles Chanteperdrix MIME-Version: 1.0 References: <5C40CD1E4697424ABDE3AC57CF1B22C603221038@domain.hid> In-Reply-To: <5C40CD1E4697424ABDE3AC57CF1B22C603221038@domain.hid> Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai-help] Perfs and rt alarms questions. List-Id: Help regarding installation and common use of Xenomai List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "RAKOTOSALAMA, Nirilanto" Cc: xenomai@xenomai.org, jan.kiszka@domain.hid RAKOTOSALAMA, Nirilanto wrote: > >>>Hello everybody. >>> >>>I managed to compile a stable kernel (the Scalability O(1) >> >>scheduler options seems to make my system freeze) >> >>That's not good. What precisely did you do? Applied the .config you >>posted, just enabling CONFIG_XENO_OPT_SCALABLE_SCHED? And what test >>case, latency? > > > > I both tested a configuration with CONFIG_XENO_OPT_SCALABLE_SCHED enabled and an other disabled. > When I enable and when I launch the cyclictest, the system hard lock and the 2 left keyboard leds blink. > When I let it disabled the system is stable. > > > >>>xenomai 2.3.1 and vanilla 2.6.20.4, gcc 4.1.1 on FC6. >>> >>>I'm programming and testing a xenomai support for a timer >> >>library using rt_alarm. The test program >> >>>lauches the timer periodically and calculate the precision >> >>(difference between theoretical and practical results). >> >>>When I launch the latency test, the max latency I have >> >>doesn't exceed 10us. So I supposed the precision shouldn't >> >>Using what load for the system? Keep in mind that unloaded benchmark >>numbers are practically meaningless. >> >> >>>exceed 10 to 20us as well, No ? But sometimes, the >> >>precision exceed 30 to 60us. Is it normal ? >> >>Depending on your hardware (CPU, chipset, peripherals), this >>can be very >>well a worst-case latency of the loaded system. Try to capture such a >>result with the tracer > > > I've tested latency with loaded system (lot of applications loaded, dd, cp, tar, find /)and have a max latency of 339us. > But I don't understand anything in the frozen trace file. You likely have either an issue with SMI, or with X-window. Read the TROUBLESHOOTING file. -- Gilles Chanteperdrix