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SubjectRe: dma api errors with swiotlb
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On 9/4/19 3:16 PM, Christoph Hellwig wrote:
> On Wed, Sep 04, 2019 at 03:02:14PM +0200, Thomas Hellström (VMware) wrote:
>> It looks like it does that, although when we send it, the SWIOTLB error has
>> already occured and been printed out, and then the sequence starts again.
> Well, the only way to really find out is to try. We also have a
> backoff algorithm in the SCSI midlayer, so it should not be much of
> an inpact. If you care about the warnings they can be disabled using
> DMA_ATTR_NO_WARN. I have to admit that I'm not even sure the warnings
> are all that useful, but that's something you need to take up with
> the swiotlb maintainer.

Yes, I guess so. I actually think the warnings make sense, since while
the scsi midlayer handles this nicely, other drivers competing for the
space might not.

Thanks!
Thomas


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