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Message-ID: <w2r74fd948d1004091119j9f33d8a6kc1824d9243abf38b@mail.gmail.com> Date: Fri, 9 Apr 2010 19:19:22 +0100 From: Pedro Ribeiro <pedrib@...il.com> To: Daniel Mack <daniel@...aq.de> Cc: Alan Stern <stern@...land.harvard.edu>, Robert Hancock <hancockrwd@...il.com>, linux-kernel@...r.kernel.org, akpm@...ux-foundation.org, Greg KH <gregkh@...e.de>, alsa-devel@...a-project.org, linux-usb@...r.kernel.org Subject: Re: USB transfer_buffer allocations on 64bit systems On 9 April 2010 19:09, Daniel Mack <daniel@...aq.de> 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@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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