From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <43A2BB1F.1070707@domain.hid> Date: Fri, 16 Dec 2005 14:03:27 +0100 From: Philippe Gerum MIME-Version: 1.0 Subject: Re: [Xenomai-help] [testsuite/latency] intervals are much > than 1 second References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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: Dmitry Adamushko Cc: xenomai@xenomai.org Dmitry Adamushko wrote: > > Hello all, > > I have been out of xeno-scope for a while so maybe I successufy missed > something important > that might be the explanation of a problem described below. > > The problem is as follows: > > x86-ipipe-1.0.10 && xenomai-2.1 (CVS: ~ November, 21) > > testsuite/letency is used as it is by defaulty (nsamples = 1 billion (1 > second) / sample (e.g.100000 us)) > > I am used to getting data with ~1-second-interval on the screen when > "latency" is running and so expected to observe the same behaviour now. > > Nevertheless, the interval (with all parameters by default) is ~ 4 > seconds, and it gets up to 16-17 seconds when -p 1000 (sampling period > == 1 ms.) is used. > > e.g. it took 1 minute and 30 seconds to get 21 lines of statistics on > the screen (-p 100) but should have been ~22-23 seconds. > > And the latency thread really reported the presence of collected data 21 > times (through rt_sem_v()) . > > So have I missed something important? any ideas are wellcome. > Dunno yet, but this reminds me of a trap I've been into recently that caused a massive slowdown of the latency test (v2.0.x) whilst the reported real-time activity seemed to be ok. Weird enough, actually. The explanation was that I mistakenly left the full ACPI support and SUSPEND active in my kernel config (Asus box with ICH6 chipset). Shutting them down solved the issue. I've not investigated further which one of the ACPI options or SUSPEND caused that trouble yet. > -- > Best regards, > Dmitry Adamushko > > > ------------------------------------------------------------------------ > > _______________________________________________ > Xenomai-help mailing list > Xenomai-help@domain.hid > https://mail.gna.org/listinfo/xenomai-help -- Philippe.