Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 9 Nov 2001 04:25:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 9 Nov 2001 04:25:46 -0500 Received: from [194.213.32.133] ([194.213.32.133]:30337 "EHLO Elf.ucw.cz") by vger.kernel.org with ESMTP id ; Fri, 9 Nov 2001 04:25:37 -0500 Date: Fri, 9 Nov 2001 10:21:41 +0100 From: root To: linux-kernel@vger.kernel.org Subject: serial console slow Message-ID: <20011109102140.A29288@elf.ucw.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.3.23i X-Warning: Reading this can be dangerous to your mental health. Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > I tried to boot my kernel using the serial console, using the > console=ttyS0,115200 (it does the same thing with 9600) ... it work great > until : > > Freeing unused kernel memory: 36k freed > serial console detected. Disabling virtual terminals. > console=/dev/ttyS0 > > At this point the output of the serial line slow down dramaticly ... almost > to a halt ... I get 1 line every 30 seconds !!! > > why is this slow down occuring ? the part which is 100% kernel is going fast > and ok, but when it become console related ... it slows down ? Serial just got its control signals (it is now *userland* writing, and userland honours them), plus userland is probably opening/closing serial all the time. Bad. Pavel -- Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt, details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html. ----- End forwarded message ----- -- -- I'm really pavel@atrey.karlin.mff.cuni.cz. Pavel Look at http://atrey.karlin.mff.cuni.cz/~pavel ;-). - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/