From owner-freebsd-arm@freebsd.org Wed Aug 26 06:24:55 2015 Return-Path: Delivered-To: freebsd-arm@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 19C4A9BF82B for ; Wed, 26 Aug 2015 06:24:55 +0000 (UTC) (envelope-from hps@selasky.org) Received: from mail.turbocat.net (mail.turbocat.net [IPv6:2a01:4f8:d16:4514::2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id C9A21CBA for ; Wed, 26 Aug 2015 06:24:54 +0000 (UTC) (envelope-from hps@selasky.org) Received: from laptop015.home.selasky.org (cm-176.74.213.204.customer.telag.net [176.74.213.204]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.turbocat.net (Postfix) with ESMTPSA id 5E2FB1FE023 for ; Wed, 26 Aug 2015 08:24:51 +0200 (CEST) Subject: Re: DWC OTG TX path optimisation for 11-current To: freebsd-arm@FreeBSD.org References: <55A7D8CE.4020809@selasky.org> <55B23276.8090703@selasky.org> <55B73113.2020308@selasky.org> <55B8AB76.7030603@selasky.org> <55B8B297.1010008@selasky.org> <20150729154516.GH78154@funkthat.com> <55B8F5EC.2050908@selasky.org> <46ad096c958.1a82a175@mail.schwarzes.net> <55B9C3E2.5040501@selasky.org> <46ae815c7c3.447237c8@mail.schwarzes.net> <46aece00b53.3c1cdc1f@mail.schwarzes.net> <55BB2A5F.9000502@selasky.org> <46baa16c4ce.6efd29ef@mail.schwarzes.net> <55CF31A1.5080205@selasky.org> <46ce372c895.20050775@mail.schwarzes.net> <46d0a4441bb.41f6f91d@mail.schwarzes.net> From: Hans Petter Selasky Message-ID: <55DD5C0A.2050401@selasky.org> Date: Wed, 26 Aug 2015 08:26:18 +0200 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 MIME-Version: 1.0 In-Reply-To: <46d0a4441bb.41f6f91d@mail.schwarzes.net> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Aug 2015 06:24:55 -0000 On 08/25/15 21:51, Andreas Schwarz wrote: > On 24.08.15, Andreas Schwarz wrote: > >> With both kernels I was not able to reproduce the initial problem. > > By accident, today I run again into the problem (with r287086). 8( > > Aug 25 20:27:59 pizelot kernel: smsc0: warning: Failed to write register 0x114 > Aug 25 20:45:32 pizelot kernel: smsc0: warning: Failed to read register 0x114 > Aug 25 20:45:32 pizelot kernel: smsc0: warning: MII is busy > Aug 25 20:46:08 pizelot kernel: smsc0: warning: Failed to write register 0x114 > Aug 25 20:46:14 pizelot kernel: smsc0: warning: Failed to read register 0x114 > Aug 25 20:46:14 pizelot kernel: smsc0: warning: MII is busy > Aug 25 20:46:16 pizelot kernel: smsc0: warning: Failed to write register 0x114 > Aug 25 20:46:46 pizelot kernel: smsc0: warning: Failed to read register 0x114 > Aug 25 20:46:46 pizelot kernel: smsc0: warning: MII is busy > [...] > It might seem like some process is using all CPU on core 0, so that USB doesn't get a chance to run. I would suggest maybe moving the DWC OTG fast IRQ handling to core #1. Is it possible you could enter kgdb, and poke around which fast IRQ is doing work there? --HPS