From mboxrd@z Thu Jan 1 00:00:00 1970 From: Russell King - ARM Linux Subject: Re: [PATCH net 0/2] net: marvell: Fix highmem support on non-TSO path Date: Thu, 22 Jan 2015 21:09:51 +0000 Message-ID: <20150122210951.GC26493@n2100.arm.linux.org.uk> References: <1421844850-30886-1-git-send-email-ezequiel.garcia@free-electrons.com> <20150121150159.GS26493@n2100.arm.linux.org.uk> <54C1443C.80909@tpi.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Ezequiel Garcia , netdev@vger.kernel.org, David Miller , B38611@freescale.com, fabio.estevam@freescale.com To: Dean Gehnert Return-path: Received: from pandora.arm.linux.org.uk ([78.32.30.218]:46889 "EHLO pandora.arm.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755020AbbAVVKB (ORCPT ); Thu, 22 Jan 2015 16:10:01 -0500 Content-Disposition: inline In-Reply-To: <54C1443C.80909@tpi.com> Sender: netdev-owner@vger.kernel.org List-ID: On Thu, Jan 22, 2015 at 10:41:00AM -0800, Dean Gehnert wrote: > FYI, I found a way to reproduce the mv643xx_eth transmit corruption without > using a network filesystem by using SOCAT (should also be able to use NETCAT > or NC) and I have a bit more information about the corruption that looks > like it is somehow related to the cache line size. That's not quite what I'm seeing. What I'm seeing with NFS is that the machine is basically unusable. I have the etna_viv source in a NFS share (it's shared amongst not only the Dove box but also my collection of iMX6 based hardware.) I'm fairly fully IPv6 enabled here, which includes NFS. On the Dove, if I try to build this without any fixes, and then try to build the etna_viv sources, it will take the machine out to the extent that I have to reboot it - either the machine will freeze solidly, or the kernel will oops in the DMA API functions, in a path which was called from an interrupt handler. That takes out the entire machine because we miss acknowleding the interrupt. Either way, it's effectively a power cycle as there's no reset button on the machine. I have yet to see any sign of data corruption. -- FTTC broadband for 0.8mile line: currently at 10.5Mbps down 400kbps up according to speedtest.net.