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 Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!news.eternal-september.org!feeder.eternal-september.org!aioe.org!.POSTED!not-for-mail From: "Dmitry A. Kazakov" Newsgroups: comp.lang.ada Subject: Re: Raspberry Pi, Real-Time and Ada Date: Mon, 10 Feb 2014 21:38:34 +0100 Organization: cbb software GmbH Message-ID: <1x2gk1geu5i5s$.e6en9z0pj29u$.dlg@40tude.net> References: <5e8fad3a-94e6-4517-af54-db8b4146803e@googlegroups.com> <858uto3cj3.fsf@stephe-leake.org> <708ef9e4-b6a3-488b-a86d-b70c7de43ac2@googlegroups.com> Reply-To: mailbox@dmitry-kazakov.de NNTP-Posting-Host: dRN93LcgZmpMwxQ2TpSF2g.user.speranza.aioe.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Complaints-To: abuse@aioe.org User-Agent: 40tude_Dialog/2.0.15.1 X-Notice: Filtered by postfilter v. 0.8.2 Xref: news.eternal-september.org comp.lang.ada:18478 Date: 2014-02-10T21:38:34+01:00 List-Id: On Mon, 10 Feb 2014 10:29:12 -0800 (PST), Rego, P. wrote: > On Saturday, February 8, 2014 5:56:02 AM UTC-3, Dmitry A. Kazakov wrote: > >> That looks pretty much slow for a 700MHz processor. You should take a look >> what exactly the implementation is (in s-oprim.adb, I suppose). > > The Ada implementation? The system calls it makes, so that you can track down the time source. >> MS does not tell which time source they use for this function. There are >> many on an Intel board. That you have 0 to 366ns (which is very poor for an >> Intel machine) indicates that probably your machine uses the HPET. HPET >> runs at 25MHz or so, which is pitiful for a GHz machine. > What is HPET? http://en.wikipedia.org/wiki/High_Precision_Event_Timer TSC is http://en.wikipedia.org/wiki/Time_Stamp_Counter -- Regards, Dmitry A. Kazakov http://www.dmitry-kazakov.de