From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <45FA7478.7070306@domain.hid> Date: Fri, 16 Mar 2007 11:42:00 +0100 From: Gilles Chanteperdrix MIME-Version: 1.0 Subject: Re: [Xenomai-help] xenomai on (old) laptop References: <45F91516.503@domain.hid> <45F9166F.3020901@domain.hid> <1173952750.8193.11.camel@domain.hid> <45F91FCC.20906@domain.hid> <45FA725E.9020402@domain.hid> In-Reply-To: <45FA725E.9020402@domain.hid> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit List-Id: Help regarding installation and common use of Xenomai List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Theo Veenker Cc: Xenomai Theo Veenker wrote: > Theo Veenker wrote: > >>Philippe Gerum wrote: >> >> >>>On Thu, 2007-03-15 at 10:48 +0100, Gilles Chanteperdrix wrote: >>> >>> >>>>Theo Veenker wrote: >>>> >>>> >>>>>Hi all, >>>>> >>>>>I'm preparing a Toshiba Satellite S1400-153E laptop for field work. >>>>>It used to run redhat 9 + RTLinux, but now it runs Ubuntu 6.06 + >>>>>Xenomai 2.3. >>>>> >>>>>Unfortunately the latency test shows high latencies (200..500us) at >>>>>irregular intervals (5..20 sec) whereas the typical max latency is >>>>>around 10 us. It doesn't seem to be related to any user action. >>>>> >>>>>I don't think this thing has SMI, anyway xenomai doesn't detect it. >>>>>It also doesn't have a local APIC. What could be the cause of these >>>>>high latencies? >>>> >>>> >>>>APM ? >>>> >>> >>> >>>You may also want to check for USB-related issues as explained in the >>>TROUBLESHOOTING file. >>> >> >>I have APM, CPU Frequency Scaling and ACPI processor disabled in config. >>I'll try to kill my USB stuff to see what happens. > > > Unfortunately that didn't have any effect (apart from the mouse being > disabled). I think I will try to work my way around it. I need 1ms > accuracy, so as long as the pathological latencies that occur irregularly > don't exeed 500us I should be OK. These latencies are pathological. Are you running X-window ? -- Gilles Chanteperdrix