Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267502AbUIFKn0 (ORCPT ); Mon, 6 Sep 2004 06:43:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267518AbUIFKn0 (ORCPT ); Mon, 6 Sep 2004 06:43:26 -0400 Received: from caramon.arm.linux.org.uk ([212.18.232.186]:32782 "EHLO caramon.arm.linux.org.uk") by vger.kernel.org with ESMTP id S267502AbUIFKnZ (ORCPT ); Mon, 6 Sep 2004 06:43:25 -0400 Date: Mon, 6 Sep 2004 11:43:21 +0100 From: Russell King To: Danny ter Haar Cc: linux-kernel@vger.kernel.org Subject: Re: Linux serial console patch Message-ID: <20040906114321.A26906@flint.arm.linux.org.uk> Mail-Followup-To: Danny ter Haar , linux-kernel@vger.kernel.org References: <20040905175037.O58184@cus.org.uk> <413BA35C.8080705@superbug.demon.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: ; from dth@ncc1701.cistron.net on Mon, Sep 06, 2004 at 10:32:27AM +0000 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1301 Lines: 27 On Mon, Sep 06, 2004 at 10:32:27AM +0000, Danny ter Haar wrote: > James Courtier-Dutton wrote: > >> I have read your posts to lkml containing your serial console flow control > >> patches firstly for 2.4.x and then for 2.6.x kernels. > > > >Does this fix junk being output from the serial console? > >If one is using Pentium 4 HT, it seems that both CPU cores try to send > >characters to the serial port at the same time, resulting in lost > >characters as one CPU over writes the output from the other. > > We have multiple P4-HT enabled servers with debian installed & serial > console enabled (RPB++ ;-) and _i_ have never seen this behaviour. I don't think this is a serial problem as such, but a problem with the kernel console subsystem (printk) itself. Maybe James can provide an example output to confirm exactly what he's seeing. -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/ 2.6 Serial core - 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/