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SubjectRe: Error: DMA: Out of SW-IOMMU space [was: External USB drives become unresponsive after few hours.]
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On 18 April 2015 at 12:10, Dorian Gray <yourfavouritegod@gmail.com> wrote:
> On 17 April 2015 at 22:06, Konrad Rzeszutek Wilk <konrad.wilk@oracle.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@oracle.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


[update]

Ok, 6 hours of uptime (3.19.4 + blacklisted rtl8192se) and everything
was fine...
However, I was checking periodically and noticed that 'radeon' also
tends to grow continuously over time, whereas ethernet driver sticks
to, more or less, the same range:

# uname -r
3.19.4
#
# grep -Eo 'radeon|r8169' L1.log | sort | uniq -c
62 r8169
4183 radeon
#
# grep -Eo 'radeon|r8169' L2.log | sort | uniq -c
33 r8169
5582 radeon
#
# grep -Eo 'radeon|r8169' L3.log | sort | uniq -c
54 r8169
7007 radeon
#
# grep -Eo 'radeon|r8169' L4.log | sort | uniq -c
49 r8169
7429 radeon
#
# grep -Eo 'radeon|r8169' L5.log | sort | uniq -c
34 r8169
9360 radeon
#

It doesn't grow that much in 3.17.8:

# uname -r
3.17.8
#
# grep -Eo 'radeon|r8169|rtl8192se' L1.log | sort | uniq -c
265 r8169
1229 radeon
142 rtl8192se
#
# grep -Eo 'radeon|r8169|rtl8192se' L2.log | sort | uniq -c
187 r8169
3159 radeon
124 rtl8192se
#
# grep -Eo 'radeon|r8169|rtl8192se' L3.log | sort | uniq -c
41 r8169
1894 radeon
39 rtl8192se
#
# grep -Eo 'radeon|r8169|rtl8192se' L4.log | sort | uniq -c
64 r8169
3370 radeon
77 rtl8192se
#
# grep -Eo 'radeon|r8169|rtl8192se' L5.log | sort | uniq -c
52 r8169
2597 radeon
49 rtl8192se
#


Btw, at some point (3.19.4) I encounetered this:
[21631.181909] DMA-API: debugging out of memory - disabling

Jake


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