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

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Date:	Sat, 18 Apr 2015 12:10:55 +0200
From:	Dorian Gray <yourfavouritegod@...il.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	Alexander Duyck <alexander.duyck@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Suman Tripathi <stripathi@....com>,
	iommu@...ts.linux-foundation.org,
	USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Error: DMA: Out of SW-IOMMU space [was: External USB drives
 become unresponsive after few hours.]

On 17 April 2015 at 22:06, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> 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@...cle.com> 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

Download attachment "dump_dma_logs.tar.bz2" of type "application/x-bzip2" (102763 bytes)