From mboxrd@z Thu Jan 1 00:00:00 1970 From: mrc Subject: Serial communication under real-time Timesys Linux Date: Thu, 20 Jan 2005 11:09:10 +0100 Message-ID: <41EF8346.8020300@imotec.nl> Reply-To: j.marincic@imotec.nl Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from relay.introweb.nl ([80.65.96.45]:23777 "EHLO relay.introweb.nl") by vger.kernel.org with ESMTP id S262102AbVATKHF (ORCPT ); Thu, 20 Jan 2005 05:07:05 -0500 Received: from brievenbus1.introweb.nl (frontend1 [192.168.4.31]) by relay.introweb.nl (Postfix) with ESMTP id 8C899866BB4 for ; Thu, 20 Jan 2005 11:07:03 +0100 (CET) Received: from mail.imotec.nl (ip114-73.dsl.introweb.nl [80.65.114.73]) by brievenbus1.introweb.nl (Postfix) with ESMTP id 68F721071C for ; Thu, 20 Jan 2005 11:07:03 +0100 (CET) Received: from [192.168.1.73] (helo=[192.168.1.73]) by mail.imotec.nl with esmtp (Exim 4.43) id 1CrZDT-0006rQ-7A for linux-serial@vger.kernel.org; Thu, 20 Jan 2005 11:07:03 +0100 Sender: linux-serial-owner@vger.kernel.org List-Id: linux-serial@vger.kernel.org To: linux-serial@vger.kernel.org We are running hard RT and soft RT process under realtime OS Timesys Linux on the industrial PC. Hard RT process has a 1 milisecond period and soft RT runs with 300 milisecond period. The Soft RT process is accessing the serial RS422 port and the driver used is the Linux serial driver. (We have an RS422 card and the driver is slightly modified by the manufacturer, but it is based on the Linux driver). The serial communication affects hard RT process performance which results in its overruns. We suspect that the problem is in the serial communication driver - either the interrupt routine is not preemptible or the problem is that it uses jiffies or something else. Does anyone know if there is a real-time serial driver available? Did anyone have experience with Timesys Linux? Thanks in advance.