[alsa-devel] USB transfer_buffer allocations on 64bit systems
pedrib at gmail.com
Fri Apr 9 20:19:22 CEST 2010
On 9 April 2010 19:09, Daniel Mack <daniel at caiaq.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?
It has 4 GB.
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