Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755309Ab0DIST2 (ORCPT ); Fri, 9 Apr 2010 14:19:28 -0400 Received: from mail-ew0-f220.google.com ([209.85.219.220]:53205 "EHLO mail-ew0-f220.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752887Ab0DISTY convert rfc822-to-8bit (ORCPT ); Fri, 9 Apr 2010 14:19:24 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=Wp5aB/RcUZlo+cpyW2m+ro7dASaJT3iHh7PZVjiIy5675F3nw0Pdgdj/hlJwAC1TJW WD6NqmPTZw+IfmKOxbDYYqE6Yl5vs5LwVKuns3/pQJA2j+2kPuZ0ylLRXKxpug6+eHOi EPftXrkhytIXceEaFJk8nUcebIJ+SiA3PuRxU= MIME-Version: 1.0 In-Reply-To: <20100409180942.GK30801@buzzloop.caiaq.de> References: <20100409180942.GK30801@buzzloop.caiaq.de> Date: Fri, 9 Apr 2010 19:19:22 +0100 Message-ID: Subject: Re: USB transfer_buffer allocations on 64bit systems From: Pedro Ribeiro To: Daniel Mack Cc: Alan Stern , Robert Hancock , linux-kernel@vger.kernel.org, akpm@linux-foundation.org, Greg KH , alsa-devel@alsa-project.org, linux-usb@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1053 Lines: 28 On 9 April 2010 19:09, Daniel Mack wrote: > On Fri, Apr 09, 2010 at 12:01:27PM -0400, Alan Stern wrote: >> On Fri, 9 Apr 2010, Pedro Ribeiro wrote: >> > here is the output of the patch you sent me when the interference is triggered. >> > >> > The log is long, 1.3mb in size. >> >> I don't see anything suspicious. ?The transfer_buffer addresses repeat >> every 32 URBs, and the DMA addresses cycle almost entirely uniformly >> from 0x20000000 to 0x23ffffff in units of 0x2000 (there are a few gaps >> where the interval is a little bigger). > > The DMA pointers do indeed look sane. I wanted to take a deeper look at > this and set up a 64bit system today. However, I fail to see the problem > here. Pedro, how much RAM does your machine have installed? > > Daniel > > It has 4 GB. Pedro -- 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/