linux-kernel - Running out of SWIOTLB space (was: SW-IOMMU / ata

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Date:	Tue, 05 Aug 2008 00:09:31 +0200
From:	Juergen Kreileder <jk@...ckdown.de>
To:	Robert Hancock <hancockr@...w.ca>, ath9k-devel@...ts.ath9k.org
CC:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org
Subject: Running out of SWIOTLB space (was: SW-IOMMU / ata_piix errors with
 2.6.27-rc1)

Robert Hancock wrote:
> Tejun Heo wrote:
>> Juergen Kreileder wrote:
>>> Robert Hancock wrote:
>>>> Juergen Kreileder wrote:
>>>>> Hi,
>>>>>
>>>>> I get lots of errors like this with 2.6.27-rc1 on my
>>>>> Macbook Pro (3rd generation), 2.6.26 seems to work fine:
>>>>>
>>>>> [  907.524509] DMA: Out of SW-IOMMU space for 45056 bytes at device 0000:00:1f.2
>>>>> [  907.524783] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
>>>>> [  907.524796] ata3.00: cmd 35/00:50:08:91:5c/00:01:0f:00:00/e0 tag 0 dma 172032 out
>>>>> [  907.524798]          res 50/00:00:ff:90:5c/00:00:0f:00:00/ef Emask 0x40 (internal error)
>>>>> [  907.524805] ata3.00: status: { DRDY }
>>>>> [  907.646590] ata3.00: configured for UDMA/133
>>>>> [  907.646624] ata3: EH complete
>>>>> Any suggestions?
>>>> You can try increasing the swiotlb size by booting with swiotlb=65536 
>>>> (for 128MB) or swiotlb=131072 (for 256MB), and see if that makes the 
>>>> problem go away.. It's unclear why you'd be running out of SWIOTLB space 
>>>> now, though, if 2.6.26 worked fine..
>>> Still happening, although 256M make it a bit harder to trigger.
>> Hmm... sounds like mapping is leaking.  Eh... iommu leak debug seems to
>> support only AMD GART IOMMU.  How long does it take to reproduce the
>> bug?  Once it happens, it never recovers, right?  Does the problem
>> happen with minimal configuration w/ only libata enabled (no network, no
>> sound, no usb...)?
> 
> Yes, that would be a good test.. Easiest way might be booting with 
> init=/bin/sh and running some processes that do lots of disk access..

After a bit more testing I'm pretty sure the problem is caused by an
external driver, namely the new ath9k driver.

Sorry for the noise on the wrong lists.


	Juergen

-- 
Juergen Kreileder, Blackdown Java-Linux Team
http://blog.blackdown.de/
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