Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932639AbXHEAA2 (ORCPT ); Sat, 4 Aug 2007 20:00:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757686AbXHEAAR (ORCPT ); Sat, 4 Aug 2007 20:00:17 -0400 Received: from gateway.howardsilvan.com ([64.146.212.27]:38680 "EHLO mail.howardsilvan.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756226AbXHEAAP (ORCPT ); Sat, 4 Aug 2007 20:00:15 -0400 Message-ID: <46B51308.4010402@howardsilvan.com> Date: Sat, 04 Aug 2007 17:00:08 -0700 From: Lee Howard User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.13) Gecko/20060501 Fedora/1.7.13-1.1.fc4 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Paul Fulghum CC: Ray Lee , Tilman Schmidt , Alan Cox , Robert Hancock , linux-serial@vger.kernel.org, tytso@mit.edu, rmk@arm.linux.org.uk, linux-kernel@vger.kernel.org Subject: Re: serial flow control appears broken References: <46A84B4A.6070902@shaw.ca> <46A8C6F1.4080309@howardsilvan.com> <20070726173121.70088a92@the-village.bc.nu> <46A98845.8010806@howardsilvan.com> <46A9F712.70706@imap.cc> <46D33636.7070200@microgate.com> <46AA5A0E.1050600@howardsilvan.com> <1185578908.2989.15.camel@x2> <46AACB4D.7080004@howardsilvan.com> <2c0942db0707280941n1b9e1f7i9c0de332286e8aac@mail.gmail.com> <46B4C393.4020506@howardsilvan.com> <46B4F8AD.3000405@microgate.com> In-Reply-To: <46B4F8AD.3000405@microgate.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1913 Lines: 68 Paul Fulghum wrote: > Lee Howard wrote: > >> And in repeat tests it is quite evident that IDE disk activity is, >> indeed, at least part of the problem. As IDE disk activity increases >> an increased amount of data coming in on the serial port goes missing. > > > Lee, you mentioned 2.2.x kernels did not exhibit this problem. > > Was this on the same hardware you are currently testing? Yes it was... except for the hard drive. I have different installs of different operating systems on different hard drives. I change the hard drive when switching between 2.2.5 and 2.6.5. > Which 2.2.x version were you using? The default 2.2.5 kernel that comes with RedHat 6.0. > Was the 2.2.x serial driver also identifying the UART as a 16550A? Yes it does. > Can you get /proc/interrupts output > from both the current setup and the 2.2.x setup? Current (2.6.5): CPU0 0: 14660696 XT-PIC timer 1: 8 XT-PIC i8042 2: 0 XT-PIC cascade 3: 1240314 XT-PIC serial 4: 778901 XT-PIC serial 8: 1 XT-PIC rtc 10: 111647 XT-PIC eth0 14: 221202 XT-PIC ide0 15: 34 XT-PIC ide1 NMI: 0 ERR: 5 (2.2.5): CPU0 0: 5908 XT-PIC timer 1: 88 XT-PIC i8042 2: 0 XT-PIC cascade 8: 2 XT-PIC rtc 10: 38 XT-PIC Intel EtherExpress Pro 10/100 Ethernet 13: 1 XT-PIC fpu 14: 36637 XT-PIC ide0 15: 4 XT-PIC ide1 NMI: 0 Thanks, Lee. - 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/