From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <47F2F6F6.70009@domain.hid> Date: Tue, 01 Apr 2008 23:01:10 -0400 From: Tomas Kalibera MIME-Version: 1.0 References: <20080402012645.506e53ef.Cornelius.Koepp@domain.hid> In-Reply-To: <20080402012645.506e53ef.Cornelius.Koepp@domain.hid> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable Subject: Re: [Xenomai-core] latencys drifting into negative (Xenomai 2.4.2/2.4.3) List-Id: "Xenomai life and development \(bug reports, patches, discussions\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: =?ISO-8859-1?Q?Cornelius_K=F6pp?= Cc: xenomai-core Hi, I don't have the answer, but just to feed my curiosity, do you know what=20 would happen if you run the benchmarks much longer ? I can imagine that=20 it would either stabilize on some value, or, it might start again from a=20 large value at the beginning.. Tomas Cornelius K=F6pp wrote: > Hello, > I run the latency test from testsuite on several hard and software conf= igurations. Running on Xenomai 2.4.2, Linux 2.6.24 the results shows a "s= trange" behavior: In Kernel mode (-t1) the latencys constantly linear dec= rease. See attached plot 'drifting_latencys_in_kernelmode.png' of latency= test running 48h on Pentium3 700. This effect could be reproduced, even = on other hardware (Pentium-M 1400). The usermode (-t0) did not show a dri= fting, but is influenced by a test ran in kernelmode before. > > I talked with Sebastian Smolorz about this and he builds his own indepe= ndent kernel-config to check. He got the same drifting-effect with Xenoma= i 2.4.2 and Xenomai 2.4.3 running latency over several hours. His kernel-= config ist attached as 'config-2.6.24-xenomai-2.4.3__ssm'. > > Our kernel-configs are both based on a config used with Xenomai 2.3.4 a= nd Linux 2.6.20.15 without any drifting effects. > > Bad luck with the config? > > > Thanks in advance, > > Cornelius K=F6pp > =20 > > -----------------------------------------------------------------------= - > > -----------------------------------------------------------------------= - > > _______________________________________________ > Xenomai-core mailing list > Xenomai-core@domain.hid > https://mail.gna.org/listinfo/xenomai-core > =20