From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Brownell Subject: Re: Preempt-RT on OMAP3? Date: Mon, 6 Apr 2009 15:20:40 -0700 Message-ID: <200904061520.59391.david-b@pacbell.net> References: <5a7b8b7b0904052025g74325484h66335606bebea5a3@mail.gmail.com> <200904060325.45758.david-b@pacbell.net> <5a7b8b7b0904061453m725eee67m4b74c73bbffeb994@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from smtp125.sbc.mail.sp1.yahoo.com ([69.147.65.184]:33557 "HELO smtp125.sbc.mail.sp1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1759892AbZDFWVV (ORCPT ); Mon, 6 Apr 2009 18:21:21 -0400 In-Reply-To: <5a7b8b7b0904061453m725eee67m4b74c73bbffeb994@mail.gmail.com> Content-Disposition: inline Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Hugo Vincent Cc: linux-omap@vger.kernel.org On Monday 06 April 2009, Hugo Vincent wrote: > > Here are some of the crashes I've seen. Warning - I'm new to -rt and > to the linux-omap tree, so I'll apologize in advance if these are just > a result of me missing something obvious. Thanks, I'll take a look. > Context: using USB-gadget ethernet (g_ether) over musb (configured as > just peripheral, not OTG). Most of the time it works, but after a > while, or when it encounters a large packet (e.g fping -b30000) it > crashes like so (apparently something to do with receive DMA usage). > Although the fping -b case is kindof pathological, I've seen the same > crash when ssh/scping files across to the board, so it does occur in > real usage. RX DMA is troublesome with the MUSB code, and there are some bugfixes pending which should affect it. (Posted to linux-usb over the last week or two.) Do these problems show up with DMA disabled? - Dave