From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 2220 invoked by alias); 11 Dec 2007 21:40:58 -0000 Received: (qmail 2207 invoked by uid 22791); 11 Dec 2007 21:40:56 -0000 X-Spam-Check-By: sourceware.org Received: from hu-out-0506.google.com (HELO hu-out-0506.google.com) (72.14.214.227) by sourceware.org (qpsmtpd/0.31) with ESMTP; Tue, 11 Dec 2007 21:40:45 +0000 Received: by hu-out-0506.google.com with SMTP id 34so170244hud for ; Tue, 11 Dec 2007 13:40:41 -0800 (PST) Received: by 10.82.123.16 with SMTP id v16mr14645863buc.1197409240386; Tue, 11 Dec 2007 13:40:40 -0800 (PST) Received: from evgeny1 ( [83.167.112.216]) by mx.google.com with ESMTPS id 5sm7449457nfv.2007.12.11.13.40.38 (version=SSLv3 cipher=OTHER); Tue, 11 Dec 2007 13:40:38 -0800 (PST) Date: Tue, 11 Dec 2007 21:40:00 -0000 From: Evgeny Belyanko X-Mailer: The Bat! (v1.62r) Reply-To: Evgeny Belyanko Message-ID: <1719361890.20071212004029@gmail.com> To: ecos-discuss@ecos.sourceware.org In-Reply-To: <475e264a.05be260a.1af2.ffffc343SMTPIN_ADDED@mx.google.com> References: <475e264a.05be260a.1af2.ffffc343SMTPIN_ADDED@mx.google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-IsSubscribed: yes Mailing-List: contact ecos-discuss-help@ecos.sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: ecos-discuss-owner@ecos.sourceware.org Subject: [ECOS] ISR Latency & Jitter @x86 hardware platform X-SW-Source: 2007-12/txt/msg00035.txt.bz2 Hi! I use SM800PC/X smartModule based on the AMD LX800 at 500MHz. http://www.digitallogic.ch/index.php?id=143&L=1 eCos from CVS, date 6 Dec 2007. Loader is GRUB. I need to process real rime events with 100uSec (10^-4 Sec) time base. Due to some reasons it is impossible to use separate real time MCU to make real time processing. If I will program eCos system timer for 100 uSec interval, is it real on described hardware? If I will use separate IRQ event with 100 uSec interval, what interrupt latency (and jitter for this time) can be expected with my hardware? The data processing inside ISR very simple, just IO acquisition and pushing data in to software FIFO. Best regards Evgeny. -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss