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

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Date:	Fri, 17 Apr 2015 17:10:07 +0200
From:	Dorian Gray <yourfavouritegod@...il.com>
To:	Suman Tripathi <stripathi@....com>
Cc:	Alexander Duyck <alexander.duyck@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.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 16 April 2015 at 18:57, Dorian Gray <yourfavouritegod@...il.com> wrote:
> On 16 April 2015 at 16:24, Suman Tripathi <stripathi@....com> wrote:
>> Try increasing the SWIOTLB size to 128MB .Default is 64MB.
>
> Ok, so I'm back to k3.18.7 (default in the latest Fatdog), although
> I'm not sure what should be the exact value of swiotlb boot param?
> Got totally mixed results from uncle Google - some says the unit is in
> MiB, some that it's 4k pages and another that 128MiB = 65536, so I
> played it safe and used swiotlb=131072.
> Is this correct?
> It may take a few days, but I'll let you know if it worked (or for how
> long, if not).

I was running 3.18.7 + swiotlb=131072 + 2 external drives plugged-in
and mounted for about 18 hours straight. The error didn't show up.

Well, I would run it a little longer, but I had to restart X and while
doing so, the system crashed for an unknown reason.

Anyway, this seems to be quite reliable workaround - at least I can
_use_ kernels newer than 3.17.8, because with that bug, popping up
after a couple of hours of uptime, it was a total show stopper to me.

Thanks!
Jake
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