Re: Error: DMA: Out of SW-IOMMU space [was: External USB drives become unresponsive after few hours.]

[Dorian Gray]

On 17 April 2015 at 22:06, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:
> On Fri, Apr 17, 2015 at 05:14:20PM +0200, Dorian Gray wrote:
>> On 16 April 2015 at 20:42, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:
>> > And easier way is to compile the kernel with CONFIG_DMA_API_DEBUG
>> > and then load the attached module.
>> >
>> > That should tell you who and what else is holding on the buffers.
>>
>> Ok, I have compiled 3.19.4 w/ CONFIG_DMA_API_DEBUG=y + the module you sent me.
>> Now, I'm not sure if I've done it right - I waited until the error
>> occured and then modprobe'd dump_dma.
>> I have attached the kernel log, but it tells me not much, if anything...
>
> The network driver is quite hungry for DMA. Did it do the same thing
> in the earlier kernels?
>
> Thanks.
>>
>> Thanks again.
>> Jake
>
>

Yeah, you're right:

# grep rtl8192se dump_dma_k3.19.4.log | wc -l
6789
#
# grep rtl8192se dump_dma_k3.17.8.log | wc -l
162
#

So, wlan driver would be the real culprit then..?
I would have never thought...

I guess I'm gonna test 3.19.4 once more (just to be sure) with
rtl8192se removed and see what happens.

Thanks!
Jake

Attachment: dump_dma_logs.tar.bz2
Description: BZip2 compressed data