From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00, REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4 X-Google-Thread: a07f3367d7,38d01316d66d8f95 X-Google-Attributes: gida07f3367d7,public,usenet X-Google-NewGroupId: yes X-Google-Language: ENGLISH,ASCII Received: by 10.68.212.201 with SMTP id nm9mr4728097pbc.1.1332164200346; Mon, 19 Mar 2012 06:36:40 -0700 (PDT) Path: kz5ni6304pbc.0!nntp.google.com!news1.google.com!goblin2!goblin.stu.neva.ru!aioe.org!.POSTED!not-for-mail From: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: Ada and linux real time Date: Mon, 19 Mar 2012 14:35:20 +0100 Organization: cbb software GmbH Message-ID: <1lnilcgari5ww.na1uw3ic1xt8.dlg@40tude.net> References: <8kb66jddm0qb.1piup0wfaho1$.dlg@40tude.net> <3a01f684-b544-4051-985d-58aab98e832c@v2g2000vbx.googlegroups.com> <13z45jd9irz9x.1j2hj7ayxwkyj.dlg@40tude.net> <5777a4dc-67ef-4a35-b929-653a4d498aac@q11g2000vbu.googlegroups.com> <4f67187d$0$7625$9b4e6d93@newsspool1.arcor-online.net> Reply-To: mailbox@dmitry-kazakov.de NNTP-Posting-Host: FbOMkhMtVLVmu7IwBnt1tw.user.speranza.aioe.org Mime-Version: 1.0 X-Complaints-To: abuse@aioe.org User-Agent: 40tude_Dialog/2.0.15.1 X-Notice: Filtered by postfilter v. 0.8.2 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8bit Date: 2012-03-19T14:35:20+01:00 List-Id: On Mon, 19 Mar 2012 06:12:47 -0700 (PDT), slos wrote: > I am trying to see how is the jitter on the periodic task. You need a better clock to measure jitter. But why is it so important to you? I mean if you need something really hard, then your task is very unlikely to be triggered by the timer. It would be some external source instead. See ARM C.3.2. With an interrupt handler you can latencies well under 1�s. (What are you programming, a Jedi lightsaber? (:-)) -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de