Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751225AbWHPXTd (ORCPT ); Wed, 16 Aug 2006 19:19:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751231AbWHPXTd (ORCPT ); Wed, 16 Aug 2006 19:19:33 -0400 Received: from caramon.arm.linux.org.uk ([217.147.92.249]:44554 "EHLO caramon.arm.linux.org.uk") by vger.kernel.org with ESMTP id S1751225AbWHPXTc (ORCPT ); Wed, 16 Aug 2006 19:19:32 -0400 Date: Thu, 17 Aug 2006 00:19:26 +0100 From: Russell King To: Lee Revell Cc: Paul Fulghum , Raphael Hertzog , Linux Kernel ML Subject: Re: How to avoid serial port buffer overruns? Message-ID: <20060816231926.GC12407@flint.arm.linux.org.uk> Mail-Followup-To: Lee Revell , Paul Fulghum , Raphael Hertzog , Linux Kernel ML References: <20060816104559.GF4325@ouaza.com> <1155753868.3397.41.camel@mindpipe> <44E37095.9070200@microgate.com> <1155762739.7338.18.camel@mindpipe> <1155767066.2600.19.camel@localhost.localdomain> <20060816231033.GB12407@flint.arm.linux.org.uk> <1155770107.8796.14.camel@mindpipe> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1155770107.8796.14.camel@mindpipe> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1073 Lines: 23 On Wed, Aug 16, 2006 at 07:15:06PM -0400, Lee Revell wrote: > On Thu, 2006-08-17 at 00:10 +0100, Russell King wrote: > > MIDI uses its own driver - sound/drivers/serial-u16550.c. My guess > > is there's something in the system starving interrupt servicing. > > Serial is very sensitive to that, and increases in other system > > latencies tends to have an adverse impact on serial. > > Have you seen many other reports of serial working reliably in 2.4 but > not in 2.6? Right now this is the only clue I have to go on... There have been one or two, but the above is basically as far as I've got. Unfortunately, I don't have any machines slow enough (or maybe with the right hardware) to exhibit the problem. -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 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/